Transparent alpha issue - uneven borders and edges in final.

Top layer is keyed with nodes with alpha output. When it stopped it looks OK
After I start to play I get edges and non transparent spots. The same in final output after render .
Stopped

While playing in Davinci Resolve/ And after render in final video as well

While playing ater I pressed spacebar I get edges. If I scroll by slider you don't see any issues.

After I start to play I get edges and non transparent spots. The same in final output after render .
Stopped

While playing in Davinci Resolve/ And after render in final video as well

While playing ater I pressed spacebar I get edges. If I scroll by slider you don't see any issues.
