You hit f10 and it messed up your default view file. God only knows why they didnt make it ctrl-f10 so that it was harder to do.
You need to go into your plane folder and delete the stucka view file. Then the game will rebuild it and it will center. Then go into settings -> controls -> view find f10 and delete it or remap it to ctrl-f10.
Then NEVER HIT IT AGAIN!