pvar needing renaming

I have a rather complicated patch in which I am using pattrstorage with several [pvar] objects. All of these work fine, except for one, which on load usually needs to be renamed or deleted/remade (even though it already has the associated object’s name as an argument). This also happens while I’m patching, and for no apparent reason. Does anyone know what would cause [pvar] to become disconnected from its associated object?

Jay