I found the reason for this and have it fixed but will wait to push the fix since it’s not critical (although I will schedule the update very soon). For now, closing and reopening as you said makes them show or also moving around the map will update the stations correctly.
Thanks for the report!
Fix: https://github.com/OpenSprinkler/OpenSprinkler-App/commit/993de61373e1ef6070390d6424fd33e5a76bd532