Does it imply anything if an "issue" reappears?

Yes, it implies you're still thinking :)

The basic idea with methods like Focus Blocks is that your vibrational setpoint on any topic always remains where you last left it.

Many people experience this phenomenon by visiting some remote place they have never visited before (usually on vacation), have some unique experiences and then forget about them after they return. It's not until they revisit that place again, perhaps many years later, that all those vibrations regarding that place are reactivated and the same ideas/experiences they had previously are re-inspired to them again. They might even start reactivating the same mental attitudes they had when they previously visited.

If you shift a vibrational setpoint using Focus Blocks/Wheels and you believe the statements you are making from that new vibrational place, your vibration has now shifted permanently. And whenever you reactivate the subject, it will be reactivated from that new vibrational place because "your vibration is always where you last left it".

So why does something that was molded into a better-feeling place come up again as not feeling good?

It's because you've had a thought(s) in between molding the vibration and now that has caused your vibrational setpoint to reactivate at a previous not-so-good feeling point. (I'm ignoring for the sake of simplifying this explanation that your Vortex is continually expanding anyway)

What usually causes your feelings about the subject to dip is that something has made you realize that you don't physically have what you are after yet and those previous habitual thoughts of lack regarding it are reactivated i.e. you've revisited that old vacation spot and all the old attitudes have come back to you.

If you were somehow able to keep your attention completely off the subject (and treat the new good-feeling emotion as being enough of a manifestation for you), your vibrational setpoint would always be attracting from the last good-feeling place and your physical manifestations would reflect that. That's why, for example, in Manifesting Experiment 1 (The Manifesting Box), I try to get people to not think about what they want again after writing the requests.

That's not always possible obviously if you are engaged in a normal, daily life so Focus Blocks was presented as a more deliberate way of allowing you to easily climb back up to those good-feeling vibrational setpoints again if you happen to drift back to those old habitual attitudes of thought.

So what do you do if a Focus Block issue reappears?

Well, for me, I just re-read my original Focus Blocks regarding that subject. At the time of the writing of them, those statements brought me from my old habitual thoughts to a good-feeling place and if I'm now back to those old habitual thoughts then rereading the statements should bring me back again within a few minutes.

Sometimes I've found that perhaps I was feeling unusually good when writing the original Focus Blocks so some of the vibrational gaps between the original statements were able to be wider than if I had done the Focus Blocks when feeling less good...it's like being able to run faster or lift heavier weights on a day when your body is feeling exceptionally strong and vital. So, in those cases, I may need to insert some extra additional statements just to bridge those gaps to make it more easy for me to re-climb the vibrational ladder when I reread those Focus Blocks.

The question then arises as to how often are you going to end up rereading those Focus Blocks statements in order to keep bringing you back to the new good-feeling place instead of the old habitual attitudes.

The good news is that the more time you spend with your new vibrational setpoint, the more likely it is that the new vibrational setpoint will become the new default for that subject and the old habitual attitudes will just fade away quietly...and your new physical life manifestations will reflect that change in your default, dominant thought for that subject.

So, summing up here, if you are using Focus Blocks and they work for a while but you are drifting back, just reread the Focus Blocks to bring yourself back to the new place again and don't worry if you then drift back again because you still have those unique, customized statements to bring your good feelings back.

The reason you now feel worse after using Focus Blocks when you drift back to your old habitual thoughts is because you are starting to acclimatize to the new vibrational setpoint so a dip from it is going to seem far more uncomfortable. It's a similar concept to that explained in Is meditation a cure-all?

Now it could be that you really don't want the hassle of having to reread Focus Blocks statements every so often to give yourself another "dose" of good-feeling and you are too impatient to allow your new vibrational setpoint to gradually re-acclimatize.

If that's the case then you can use the more head-on clearing methods explained in Manifesting Experiment 4 and Manifesting Experiment 5. There's no right or wrong approach or method...just use whatever you feel works for you the most effectively (or whatever you feel most intuitively drawn towards) at this time in your life.

Hope that answers your questions.