Hey, @Painaitorr_????????1631. Welcome to the Lightroom Community. I'll need more info to help you figure this out. What version of Lightroom, Device & the Android OS are you working on?
Does this happen with videos from a specific source? Was this video shot & imported on the same device?
You have an active subscription to Lightroom. Please log in to Lightroom Web (https://adobe.ly/4gFDBne) & check if the video has synced up to the cloud correctly.