Clear calibration during process doesn't delete old data


I try to understand why I have old injections data for only some of my target calibrated compounds and other are ok. I have no idea. 

First here how I usually proceed to my calibration with bracketing mode at "none".

When I check the curve, the majority of my 30 calibrated compounds have one calibration point like it is supposed to be, but some have old or more recent injection data when we look at those curve points.

How can this happen? How can this only happen to some of my compounds. 

The majority of them are ok with one point only. 

THank you for your help. 


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