Frame Speed Slows to a Crawl

I am doing a simple pedestrian video in Twinmotion. I have maybe 25 frames or so, and everything is fine until the final two frames. At that point the two frames crawl almost to a standstill. It literally takes about two minutes for them to complete, which makes them unusable. I exported, thinking maybe the export would be ok, but it too slowed down at the same point.

I can see where to set the overall video time, but is there a way to edit the frame speed of a particular frame…in this case, speed them up? Not really sure what’s going on.

Thanks.