We run the same 6061 fixture on two shifts. Day shift is fine. Night shift is leaving a 0.08 mm wall shift that shows up at inspection the next morning. The offset screen still says the same G54. Nobody is editing the program.
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Put a known pin or a bored gauge point on the fixture and make the first cycle of each shift probe it or sweep it before cutting. If the pin moved, the vise or the pallet did, even when G54 still looks unchanged.
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Write the shift handoff as three numbers: tool length of the finishing tool, the pin reading, and the last good part. A wall that moves only at night is often a warm machine plus a vise that was opened and not seated the same way.
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If the pin is stable and the part still moves, look at the clamp order. We had a night operator tighten the moving jaw first, which walked the part into the fixed jaw by about the amount you are seeing.
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