Kim Zolciak and Kroy Biermann

Just when things seemed to be turning around for Kim Zolciak and Kroy Biermann, there's more drama at home ... and it's all because of what each said about the other in police body camera footage.

Sources with direct knowledge tell TMZ ... Kim and Kroy are fighting again, and this time it's over the newly released footage from their interactions with police during their nasty divorce, which they've since called off.

IN TEARS WITH COPS

Specifically, we're told Kim and Kroy are upset about what each said about the other to the cops. In the video, Kroy tells police Kim has a gambling problem and she tells officers Kroy may be suffering from traumatic brain injury.

The footage is from May, when…