That unfortunately is a known bug. 10.4 brought some new cool features, but some how broke for the scoreboard in a way that I could not figure out how to work around. If you are just working with the primary releases, the following versions also exhibit the issue: 10.4, 10.4a, 10.4b, 10.4c. 10.3 was fine. 10.4d and 10.5 are fine.
The scoreboard package has been part of our training classes since 2006. When I decided to release it, I held the OSVVM release of the scoreboard until the current version of the tools addressed the issues.