Lightroom new Colour Space and Deep after Update? HDR Problem!

Hello everyone,

i need your Help please, because i cant work with Lightroom at the Moment. 

For Timelapse and Pictures i edit them in Lightroom, then i export them in Tiffs Rec2020 HDR. To make a Timelapse or Video i use DaVinci. All Colour Spaces are right for the Workflow and it worked very fine all the Year. But seems like after last Lightroom Update, Lightroom changed the intern Colour Space and Deep. If i test old Pictures Tiffs with HDR edited with LR in DaVinci, they work fine and they look exactly like in Lightroom. So it can't be the Problem from DaVinci. But the new ones look ugly and i cant match another Colour Space. So my Question is, is in Lightroom is an Colour Managment update or Failure?

I really hope someone can help me fast, i want to upload my next Video 🙂

Patrick