No its not normal, its a bug: CSCun11124
Which version are you running on WLC ?
Use this version: 188.8.131.52
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I'm having this same issue which is causing my APs not to join to the controller after moving them over. Is this still a beta copy? 184.108.40.206, i'm running 220.127.116.11 at the moment.
Yes its a bug but i haven't tried this on Hyper-v ,you can test the same after up gradation of firmware and see if this happen on Hyper-v live migration also .
vWLC serial number changes when using DRS or Vmotion
when using DRS or vMotion to maintain high availability on vmare the UUID changes and invalidates the AP licenses.
setup DRS rules or do not use vmotion to keep vWLC on single host.