strange error on mikrotik crs 326

Hello,
i have a mikoritk crs 326 and today i face a strange issue with that,
i have connected a server to ether6 and access it to vlan id 105 but interface ether5 was disabled from interface menu, my server that connected to ether6 can not reach my router and i have search many hours then for test i have enable ether5 then that server is connected to ether6 start working fine! i have disabled other ports but there was no problem with them and the only problem was with ether5 , again i have disable ether5 and i see server which connecetd to ether6 stop working!
any idea?
i could not understand it,
thanks

Are ethernet ports members of a bridge? If yes, what’s MAC address of a bridge and is it perhaps same as MAC address of ether5?

yes, all ports are member of bridge.
bridge mac is CC:2D:E0:D6:DD:E0
admin mac for bridge is CC:2D:E0:D6:DD:E0

ether5 mac is CC:2D:E0:D6:DD:E4
ether6 mac is CC:2D:E0:D6:DD:E5

it seems it was a bug, i have upgrade routeros to 6.43.2 and the problem solved,