It was moving very fast, and travelling speed and direction was uneven

I am a astrophotographer and I was casually making a star trail and during editing time I noticed a strange light. I am sure that it was not a satellite or a asteroid or any space debris cause the light was travelling from earth to space it was going horizontally and it was very fast and the whole thing was blinking like not a small part like lights but the whole thing and the same incident happened in 2021 on the same day but it was observed by a pilot during his flight and even in 0.25x the speed is way too much of that object, the shape is like it was blinking and moving very fast and as a astrophotographer I checked if there was any satellite or asteroid passing through but no the sky was clear with stars only