The tag associations should be there. Please ensure tha file details are turned on in View menu. Also, try search on these tags to know if any media is assocated to them or not. To search, click on the ">" chevron sign which appears when you hover mouse over the tags in tag panel.
Well, that worked in May. Last week Elements dumped my whole Library again. On reimporting only a very small fraction of tags were restored. Quite frustrating.
I don't know if this is your circumstance, but this morning I discovered that the PSE11 Organizer wasn't responding to my clicking on any of the tags I'd brought over from PSE8 last week (several dozen tags with upwards of 7000 media), whereas last week it was working perfectly.
What apparently had happened was that there was a tag already selected, but the keywords/tag panel at the top of the workspace did not appear after I'd clicked on a tag. Subsequent clicking on any other tag added to the keyword search, but I could not see that. I closed PSE11, shut down and restarted my computer and everything resolved itself.
As I said, I'm very fresh to PSE11, so I apologize in advance if the descriptions I've used above are not exact.