RatOS 2.1 - wrong z-offset value

I had this Problem more than once in the last days. Today I printed two parts, worked great, changed filament, and the nozzle hits the bed, not extreme but it would rub audibly. After emergency stop I tried again, rehomed, z-tilt and it still rubbed. Recalibrated z-offset and the value is a millimeter off to the last one. I am not quite sure if the last times this happened I also changed filament in between but it is possible. I upgraded to the latest 2.1 version recently (I already was on 2.1 before)

Vcore 3.1 with a BL-Touch Sensor

Hope someone has an idea how this could happen and how ti fix it.
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