I am the Skipper of my Sea Scout Ship.
As a Key 3 and Training Chair, I used to be able to add trainings to those Leaders and Scouts in my units.
When I go to add trainings in the App or via the Website the trainings field is blank.
This appears to be a system issue as I see the same behavior. Unfortunately the team that supports my.scouting.org only accepts bug reports from Council staff. You will need to contact your Council and ask them to open a member care ticket for this issue.