So my enemy started going down the ladder as I went up, seems a little weird I just want down and then took him out.
Could you explain a little more to why you think its a Bug 
Did the enemy get stuck on the Ladder as you went up?
Do you remember if you went down the ladder first and then went up the ladder when you saw that the enemy followed you?
Sorry I might have misinterpreted what you meant
Sorry it was a little sparse but what happened is I went up the ladder onto the level above and then the enemy aggro’d me so I went back down and he was following me down the ladder. It just seemed off that when I climbed back up as he followed me down, he just stopped entirely like you said.
Hm not seeing the problem here.
The enemy ai is set up to use ladders (if they are able to) and follow you.
What do you perceive as flawed in this situation?
Silas