I would really like to advice you to use a single bridge and add VLAN filtering according to this great topic:
http://forum.mikrotik.com/t/using-routeros-to-vlan-your-network/126489/1
And please don’t use VLAN ID 1, that will save you a lot of time and frustration.
If you would like help on that, your complete config would be necessary (make sure to remove serial and any other private info):
/export file=anynameyoulike
Your config is a bit more extended than I expected. Will take some time to adjust. Starting point would be this link:
https://help.mikrotik.com/docs/spaces/ROS/pages/224559120/WiFi#WiFi-CAPsMAN-CAPVLANconfigurationexample: