Bug Export via Grid

Hello,

I try to export my categories but somehow an error occurs every 20th row, so that the row is written incorrectly in the export. Does anyone know why? Attached a picture of the epxport. See lines 21 and 40.
I already tried csv and xlsx.

exact pimcore version?

The bug exists only in my test environment. (Version v6.6.7).
I found out that there is no problem in my other system (Version v6.8.5).

So the problem is already solved I think.