could a exhaust leak before my wideband sensor and my stock o2 sensor cause the car to run lean even if the car is tuned with handata?

an exhaust leak will report leaner conditions then are actually happening. If you use the stock o2 sensor with closed loop enabled then you will run richer then you need to.

hmmm well im running leaner than normal almost all the time, my hondalogger is telling me that the 02 sensors are changing the are fuel ratio by about -5% what could cause this change then?