HI, I've created two core fields (called test2 of type Rich Text and test3 of type Text).
For user "test", I used Dynamic Registration form, created two RTE fields and entered some stuff.
For user "test2", I used DNN "Managed User Profile" and entered some stuff there instead. The picture below show the results from Dynamic User Directory:
For now, you will need to use Dynamic Registration if you want the RichText to show up properly under Dynamic User Directory.
However, in the future, our developer will implement an enhancement to DNN "Managed User" core profile to fix this issue. -- David