The CA hinges are hard to install. One wouldn't go in deep enough. Luckily the excess went into the other side (aileron). Then when I got them all in and pinned them, I couldn't get them into the other side (aileron).
This is why one must always trial fit the CA hinges into the wing and ailerons. If they don't line up or the slots are not deep enough, you simply take your x-acto knife and fix the problem. Some CA hinges are more flexible than others, and as a result, they can be a little bit difficult to slide into their slots. However, with a little patience and some swear words, they will go in. I always add additional CA hinges between the factory ones for extra insurance.