Your configuration on OpenWrt looks good, so it's probably a question about the configuration of your AP (for example, DHCP or static IP, management network/VLAN, VLAN tagging status).
But since it is working for you now, that's great!
If your problem is solved, please consider marking this topic as [Solved]. See How to mark a topic as [Solved] for a short how-to.
Thanks! 