So you mean on pfsense you had a scope of say 192.168.1.100-200 and the APs had static IPs of say 192.168.1.150?
So some dhcp client would come on get an IP of 192.168.1.150 from pfsense?
So this could cause issue with pinging the AP ip or accessing its gui interface over http. But it should of had little to do with other clients connecting to the network in general or even using the AP. Unless these AP were not actual AP and were say natting, Some other client should of been able to use the wireless or wired network just fine
The only point of the AP ip in actual AP use would be to access the AP directly for config, it has nothing to do with connectivity in general to the network.
When you say AP, that normally means a device that bridges traffic from wired network to the wireless. Its IP is not even used in this conversation between a wireless client and wired network.