Incorrect holding period of trades

Same start date, but the holding period is different. Didn’t sell anything. Why is that?

Look at the tooltips on the bubble at the right side of your picture.

Tooltips are related to N. of transactions

The holding period for trades comprising multiple buy transactions (which is what the tooltips would have shown you) is an average, weighted by the number of shares.

it started on 08.07.2022
thats not 153 days until today

~$ date -d "-153 days"
Do 4. Aug 14:40:11 CEST 2022

because all transactions are counted

Seems a stupid approach to count holding period but thanks for explanation.