Raids disappear and dont finish all waves

Raids have not been finishing for me. I start them with bad omen and they are normal for a few waves, but then the raid just ends. No more waves, no more purple raid bar at the top, they are just gone. A lot of the raids I start never even make it to a point where they spawn evokers. I have tried clearing the mob cap. Sometimes they finish, other times they dont. Its a weird thing. Also, when they end early i dont get hero of the village. The raids just disappear. This has been happening in my raid farm and when i try to fight raids by hand in a village. It has also happened to another player on my realm. This issue has only happened to me on realms.