Can lessors re-order an expert report, leading to higher costs?

Hello together, the following case. Leasing-KFZ was returned in April 23. On the day of the return and in my presence a return-certificate was prepared by an external company (GKK). Let us say exemplarily that the lower value was estimated at 1000€. In June 23 and in the course of the repairs another report was prepared by the same company, the lower value increased now to 1500€ (exemplary). The order for the new report came from the lessor and without my knowledge. Statement of the expert: “In the second order all the further damages were considered and taken up again. Since by laying out and polishing the tailgate was not possible sufficient repair for the tailgate, the repair method was changed to varnishes. When replacing the light metal rim at the front right, there was an increase in the costs, since in the first condition report no work performance for the renewal of the rim was taken into account. This is now included in the price.” } FRAGE: Is it lawful that the original report (on the day of the return) loses its validity and in the context of the repair “man’s greetings”?