Auto deletes images

I experienced that WPGHS does sometimes deletes images I want to provide in a separate folder. I don't see any pattern why this happens. It even has nothing to do with the post it syncs. 

For example:
https://github.com/pixelstrolch/accessible-pdf/commit/0554f18b9157f110a974a12717a4412194fc9b74
