fix to the coding needed

draw offer should only be sent after the player moves
player must not be able to activate draw offer until it is their move
and then
it must be activated prior to a move
then when a move is made the draw offer appears simultaneously

players should not be able to offer draw after their move and while other player has been thinking

Chances are the connection to the server was temporarily lost and your move had not been transmitted. It happens to me every once in a while. The word "disconnected" appears at the top of the window, but if you're focused on the board it's easy to not notice.

Or maybe you made the move in descriptive notation and it was confused.

why