What did I just see from the video feed from the ISS? UFO?? November 2020

My daughter and I was sat at the dining room table, when she spotted a slow moving star - I grabbed my phone, got up the ISS app and sure enough, the ISS was moving past the moon from our position at our dining room table at home in the UK, but what we witnessed next I can't explain and it was right before the live feed was cut. I've enlisted the help of my kids to help explain what we saw. Never work with kids or animals lol