queue tree - missing marked traffic

Hello,

I’ve got mangle matcher to assign packet mark “bulk_traffic” to all packets that are not being marked as voip (do not shown).
The matcher works fine but what surprises me is why I have much smaller packet counter on the queue tree that should match bulk_traffic.
Refer to the screenshots please. Counters in both windows were reset at the same moment.
What am I doing wrong with queue tree that it doesn’t shape all marked traffic?
There’s no other traffic crossing the bridge other than the one that goes to the Internet. I’ve got 4G modem attached to the lte1 interface and it had 3Mb/s downstream traffic at the time of making this screenshot.