Guild Wars 2

When you have to feed the squid with pirahnas so it will grow and lower the balance, it got stuck and wouldnt grow further/get the balance lower.
The balance was at the last position before we could access the checkpoint.
The squid was still accepting pirahnas, but without any effect. We gave him more than 20 fish while in this last position.

Did anyone experienced the same bug? Or am I missing something?

Tried twice: Bugged 2 floors down from top the first time, worked the second time in Easy mode.