Setup: metarouter / OpenWRT

I am having an issue with my configuration and am sure I am over loading the obvious. I am running OpenWRT in a metarouter with two interfaces.

Interface A is linked to a bridge spanning ports 2-4 on network 192.168.88.0 with IP address 192.168.88.250.
Interface B is linked to Ethernet port 5 on network 192.168.99.0 with IP address 192.168.99.10.

From OpenWRT

On the 192.168.99.0 network I can ping any device except 192.168.99.1 which is the router.

On the 192.168.88.0 network I can ping any device except 192.168.88.1 which is the router.

From any device on 192.168.88.0 (except OpenWRT) I can ping any device including the 192.168.88.1.
I am trying to figure out if the issue is on OpenWRT or RouterOS to narrow down the troubleshooting process. Any pointers would be great. thanks