Why don't these actions work on repetition?

I have one page of a course.

There are six identical buttons on the page (they would be different in the real course.) When learner clicks each button, a layer flies out from the left. They all work fine. BUT if I try to click a button after I've clicked it once, the appropriate layer appears but doesn't fly out. And when I've clicked all six, they don't fly out either.

Any suggestions would be great.

Thanks,

Ken

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