Oh - I have no idea why this would happen. I didn‘t have another device for playtesting and on mine there weren‘t any bugs i noticed.
There are only two fail conditions: Getting hit (precisely when the hit marker turns to a cross and one ship‘s hitbox collides with that tile) and crashing ships into each other.
If you are sure it‘s none of the two then there has to be a bug i didn't catch - probably related to gui scaling or something along these lines.