Rule number 1 after a weak/preemptive bid never sell your hand twice (only reason to do so is holding a extreme pattern).
Seeing all hands south bidding is a bid strange. Bidding you suit 3 times with a passing partner can't be the right move (4♥ is a underbid starting with a double is better because his partner doesn't need a lot for 6♥).
Partner lift them to 6 level so trust him 6♥ will be set.