I am a bit confused with the campaign ending (SPOILERS)

So I’m on ACT 4 Chapter 2. I saved JD and killed the monster,
Then the credits roll?
Wheres ACT 5?
It says I’ve completed about 74% of the acts?
After the credits roll it just goes black and kicked me out’ve the game.
I come back in and I click resume game and I’m back killing the monster again?
WTF?
So many bugs :joy:

There’s no Act 5.

I heard that there are some side quests (attached to Act 2). Could that be it?