You are right, it is not normal. Like the Zalion above said obtain the tech support of the AP with the problem on the commandline of the controller:
show ap tech-support ap-name <name of ap>
Above is the output of an AP that is working. Initially when it booted up, the "Current Hardware State" did not negotiate LLDP yet. In the end the "Operational State" negotiated LLDP and got 20.2 watts and has POE-AT power.
Do you have LLDP enabled on that port?