This is normal. You must have accidentally hit the "Page Down" button. On the right side of your keyboard, there is a button that says "Page Up", and another button that says "Page Down". Using these buttons, you can adjust the position of the camera. Also, at the end of your statement, you seem to dislike inverse controls while your tank is backing-up. This can be turned off. It is simple, next time you play Tanki Online, click the "Settings" button (which is the button with the gear on it), it is in the top right-hand corner of the screen. Un-check "Inverse turn controls while moving back". Don't forget to click "save" when you are finished.

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