Hello Lee,
Don't worry. This is not a problem. There are TWO PrepCasts in the PMI system. One retired, one active:
- PREPCAST: This is the retired course that you probably used
- PREPCAST5: This is the current and active course that you should be using
So... simply log back into the CCRS and re-submit your PDUs using the 2nd of the above and then you are good to go.
Oh... and please don't ask me why on earth PMI even allows you to submit PDUs on a retired activity. I can only shrug my shoulder on that particular "feature" of the system...