VLANs on bridge in ROS are handled somehow differently than with other vendors. You may want to go through this tutorial: http://forum.mikrotik.com/t/using-routeros-to-vlan-your-network/126489/1
vlan interfaces (created in /interface/vlan) are kind of pipes with two ends: one is tagged and is “anchored” to intetface, named in “create” command. The other is untagged and has to be used explicitly, e.g. as interface through which ROS interacts with that VLAN (just like you did when you set IP address). The “pipe” filters ingress frames on tagged end, only allowing frames tagged with appropriate VLAN ID. Frames which are alliwed to pass are thrn stripped of (outer) 802.1Q frames and get pushed out (as untagged) through the untagged end. In the opposite direction the untagged end accepts frame, adds 802.1Q header with VLAN ID set to appropriate value, and pushes tagged frame out through tagged end.
So conceptually, vlan interfaces are not bridge ports (neither tagged nor untagged). If used as in your case, they are anchored off the switch-facing interface of the router (it is confusing that all bridge personalities are named equally).