Mikrotik. Losses on VLAN -> Tx Drop more than 2 million

Question

Mikrotik

Good afternoon
Yesterday I upgraded to 6.7 (previously worked on 5.x) version. That's what the upgrade was for. so that Mikrotik sees all 4 cores on the processor. An Inter Server Pro 1G Dual Port card was also installed. Mikrotik rebooted everything works great. The night passed and I checked tx DROP on Vlan - there were about 2 million drops. There are no drops on the interface itself and there are no errors either. The question is - where do the drops on the VLAN come from - and where to dig ... If everything rested on the PCI ex bus, then the drops should be on the physical interface itself, right?
there are only 133
queue tree rules in the firewall not a large number of rules are used max 10
CPU - 4 core Intel
each network (ether) uses its own core