It seems the bug is only on that port  g2/0/45 but not this switch. However, in order to confirm it, you need to test if poe is normal on g2/0/x  other ports, so that determine the bug is  on port, or stack/slot or switch.

I don't meet your issue before, but the last time I saw the LED is blinking blue, green, red because of power inject, so this problem must relate with low power. If I meet this problem, I would try to check like below.1. the wired cable is normal2. c...

Please check your 2802 AP whether in your country code, or -uxk universal. If it is -uxk, 5GHz can't be access default. It need some other way to set it.