'Ghosts' in DTTG Reading List

Hello,
I have five items listed in the DTTG Reading List. All UI text is showing with a reduced intensity. I can select the individual items, but I cannot get information or open them. I moved the files in DTPro, but I don’t see in the DTTG handbook that that is a problem.

Any ideas or suggestions on what could be the issue and how to deal with ‘ghosts’ in the DTTG Reading List?

Thanks,
Francis