Maid/Butler
 

Need to have a look at bulter/maid its buggy. Sometimes Butler spawns twice in a row within 5 mins or so, sometimes when you kill Maid PH it bugs out, despawns and respawns again with full HP meanwhile it despawns and respawns the Butler and or butlers PH when it does happen.

Does this happen when it's near day time or night time shift?

There is a different maid/butler that can spawn depending on the time of day.