RB433AH Queue Tree broken when switch feature enabled

Hi. I have RB433AH when eth0 is internet connection and eth1 and eth2 are bridged together with ath0 to br0 bridge. I have also Queue Tree for VoIP and VPN prioritize. This works perfectly. Than I have tried to replace the br0 bridge partly with internal switch functionality. I set master port for eth2 as eth1, disabled ath0, removed bridge and also reconfigure Queue Tree to follow the changes. It also worked perfectly until the moment when general download queue was saturated (about 10.8 Mbps). Than Queue Tree was unable to reserve enough bandwidth for VoIP call on upload (about 88 kbps). It ensured appropriate download (88 kbps), but only about 20 kbps on upload (which is not enough for clear VoIP call).

When I have disabled switch and returned to the bridge configuration, everything is now ok.

Any idea what’s wrong. I have checked configuration many times with my colleague and found no mistake. Am I doing something systematically?

Thanks, MarSarK