Variables just don't work

Hi all,

 

I am experiencing a weird issue with my project. I have used a variable (that I am always using with my projects) called NextLayer that adds 1 to the variable when the user clicks the next button and subtracts 1 with the previous button. Usually it works quite well. Not so much this time. The layers simply do not show on some of the slides although I used the exact same triggers for other slides and it does work there. Strange, huh?

Could somebody have a look and tell me what I am overlooking? [Nevermind the layout, it got messed up when I copy+pasted the slides into a new project.]

 

Update: I forgot to mention that going backwards is also completely messed up, instead of going to the previous page (as defined in the triggers) it sometimes advances to the next slide instead or goes random ways.

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