A couple of things are at play here;

Firstly, your connections will be affecting the readout. The output from a lambda sensor isn't very large and a poor connection will not help.

Secondly, the ecu calculates the time from when a change is made to the fuelling until the sensor 'sees' this fuelling change and if you move the position of the sensor then the results get screwed up. You should, if you want the ecu to do work properly, modify a table in the code to let the ecu know about the position alteration.