I was trying to make a huge gate that is powered by pistons. I was almost completely finished when I noticed that one of the pistons in the closing mechanism wasn't working like the other 36 or however many there are.

When it was activated, the wooden part of it stuck out (like it should), but another wooden part appeared and stayed in the "closed" position, and then stayed in that position.

It should have open and closed like the others nearby it, but instead it open and closed at the same time. It wasn't an issue of the redstone activating it because I thoroughly checked that.

I took a couple of screenshots which will be included with this post.