Over and above the issue/non-issues related to your specific property is the fact that very few lenders provide financing for manufactured homes. Your property does seem to fit the basic criteria (owner occupied, permanent foundation, owned land, built after June 15, 1976); but, I am contacted daily by consumers who are not able to find a lender who will finance a manufactured home.
As a result, many consumers and agents tend to avoid considering manufactured housing as an option and focus solely on stick built properties. This, in turn, puts sellers in the situation of hoping a cash offer comes their way.
There are alternatives...for both sellers and buyers. One thing you and your agent can do is get clarification to other agents and/or potential consumers about the available financing options for your property. Admittedly, there are few lenders who work with manufactured housing; however, we are here and willing to assist.