i did this by accident for the front wiper once.
Find the rear wiper motor & it should have a large cansister on it housing the motor itself & the magnets.
It's usually secured by 2 screws/bolts to the mechanism.
Becuase they are opposite, it can be put on the wrong way.
The fix is to undo the screws.
DO NOT REMOVE THE MAGNET PART.
all you need to do is turn it half way round so that the screw holes line up with the other one.
Reinstall screws.
Can't say this will be the exact fix to your problem, but it's a free one, and can be put back again if it doesn't work.
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