I have voltage leaking between two wires!
Any time I measure an undervoltage like that I immediately suspect a broken or floating neutral wire. This is potentially hazardous because it means other outlets and devices in the same house may be seeing an overvoltage. 

If you are confident that you have measured those voltages accurately, then all the electrical service in your house may be dangerous. The safest thing to do is turn off the main circuit breaker and call a licensed electrician.