Z-offset inconsistency

Hi!
I have a problem with the calibration of my buildplate. I have several 3 Ratrig 500 on which I always produce the same part. There are 5 of them on the plate, the first part on the door side is always too far off the plate and the others are ok. If I play on the Z-offset while printing the first part, the others are then too stuck. I print in ABS at 110°C (I leave the plate to heat up for about 30 minutes before printing). I use a ratrig super pinda for mesh calibration. Have you ever encountered this problem? Do you have any ideas on how to solve it? Thanks in advance for your help !
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