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First, don't ever use cyanoacrylate near anything with electronic contacts. That stuff puts off nasty fumes and seeps into every nook and cranny. I wouldn't be surprised if it were the cause of your problem.

I didn't know about the dangers cyanoacrylate. I prefer hot melt glue too, but the instructions called for superglue, so that is what I used

Rob said:

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I'm pretty sure it's a dying encoder. I tend to replace the encoder as a matter of course when I get a button kit in to do - the cost is so low you may as well do it while it's all apart.

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Without some form of adhesive, we've found that the board tends to not stay in proper position.