How do you have the discovery setup for the new WLC? Are you providing it via DHCP to that AP? If you havent modified the discovery process then either the AP is getting the old/local WLC IP or if it isnt getting it upon boot it is using the last known WLC it was associated to.
Verify how the AP is doing WLC discovery, i.e. DNS, DHCP, Layer2, etc. If that is correct then factory reset the AP to remove any previously known WLCs from it.
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