Transcoding Green Bar - Intermittent

I'm getting a green bar intermittently when watching a recording transcoded.
I'm using a Synology DS218+ with 6GB RAM and an android phone. Let me know if you need any other information. Screenshot_20190408-181249 a

Looks like an artifact from the original broadcast. Have you viewed that same segment without transcoding to ensure that the problem is with the transcode?

It's not on the original recording, it doesn't appear when it isn't transcoded

Does software vs hardware transcoding make any difference?

It's going to be hard to test that as it's happening intermittently but I'll see if I can get it happen on software only