Hmm... I've never had this problem. BUT... I did have a problem correlating up to right and down to left on when using turn signals. It might help you out.
Imagine a coordinate grid.
Up is positive; right is also positive. Down is negative, left is also negative.
Actually, left is usually represented as negative in any range of subjects. In physics, for example, if an objects net movement is to the left, the distance moved if expressed in a negative rather than a positive.
Hope this helps, at least a little bit.