It's very possible that the HOA is taking extra precaution just in case your property forecloses by attaching a lien to the property to assure payment of the debt. You should confirm this with an attorney for your protection.
Good luck to you!
Marsha B. Washington
Coldwell Banker Residential Brokerage
SFR - Short Sale/Foreclosure Resource
NFMC - Foreclosure Mitigation Counselor