I have noticed that this is a problem for several people who use their smart phones quite a lot to play chess here. They make a tentative move and then stop and look everything over before submitting the move. Unfortunately the 'submit move' button is right there at the bottom of the screen where it is very easy to have a finger or thumb touch it by accident.
Here are a couple of ideas that may be helpful:
Change to a two step action on the phones to cut down on accidental submits. When you hit 'submit move', a 'confirm' button then pops up, giving a chance to back out if it was not an intended action.
Or, leave the action to work as is, but change the layout so that the 'submit move' button is at the top of the board and not so close to fingers and thumbs.
Would either of these changes be of help?