Hello @slomdog ,
If you have some issues being displayed on the board but only the sub-task issue types that are not visible, the issue type is most likely being blocked or not included in the boards' filter.
I recommend starting at the filter to verify, check out "Configure filters" for details on where the settings are located, and the following thread discusses this further with some examples of how the filter was misconfigured in the other users instance:
Connect with like-minded Atlassian users at free events near you!Find an event
Connect with like-minded Atlassian users at free events near you!
Unfortunately there are no Community Events near you at the moment.Host an event
You're one step closer to meeting fellow Atlassian users at your local event. Learn more about Community Events