I don’t know why that would happen unless the names of files are incorrect, or the seen was purposefully tampered with. Do you remember where you got the voice patch from? It may be a fake version of it.
Here’s a working seen file. It may fix the problem, but if it doesn’t then I’d just settle for a reinstall.
I’m working on porting the updated audio from the psp version over, so there’s always that for future 
