Deep stack chip spewing?

First post here.

Couldn't find a handhistoryconverter for cryptologic so I'll try my best.

Played the opponent a lot of times, thought I had a good read. VPIP 20.2 and PFR 13.64. He has about 2100$ and I have him covered. I was actually pretty sure he didnt have a 4 this time, we were in some battles earlier. And if he had a 4 I actually thought he might fold.

dealt to HERO [Qs Ac]
Bigjugs99: calls $10
samuraj: folds
HERO: raises to $40
Barcrest: folds
Tigero: folds
Bigjugs99: calls $30
----- FLOP ----- [5h 4s 4d]
Bigjugs99: checks
HERO: bets $75
Bigjugs99: calls $75
----- TURN ----- [5h 4s 4d][6d]
Bigjugs99: checks
HERO: bets $185
Bigjugs99: raises to $370
HERO: calls $185
----- RIVER ----- [5h 4s 4d 6d][Kc]
Bigjugs99: bets $500
HERO: raises to $1684 and is all-in