problem while using mentor

While using the Mentor, I have encountered a problem with it not registering when I choose the proper move. I realize that if you choose the wrong response and don't click try again it doesn't register if you do pick the right move at that time, until you click try again. However, recently I have noticed that on two different occassions, I know I have literally just went from piece to piece across the board, while carefully making sure I haven't missed any moves. It isn't registering when I do chose the right move. I just finished a puzzle by GM Sam Shankland called hidden resources , I know I picked the right move at least 3 different times and it didn't register it as a correct response. If you think I am crazy, look at my scores on harder puzzles, I never get that low of a percentage. It wasn't even that difficult of a move choice to find. It was a simple pawn sacrifice, which you get back later, that greater increases your chances for activity.Please, look into this, there is nothing more disheartening than to feel like you are trying to get better and see actual evidence to confirm this, and your correct answers aren't accepted as so.

I see it posted this inspite of the server error. I wish I had known that or I wouldn't have wasted my time typing a new one. I guess I'll better and check next time, hopefully it won't.