There are griefing objects that can be rezzed on a region; anyone who goes there will have their HUDs and all other scripted attachments put into a non-running state. For instance: a HUD for a mesh body, and all the mesh body parts you are wearing, may be broken at the same time.
You might also have been affected by what appears to be a server-side bug: BUG-41379.
Below are things you can try to get the items working again.
First of all:
Top Menu → Avatar → Avatar Health → Refresh Attachments. See if that fixes the items.
Things to try:
Preferences → Firestorm, top option), relog, then try again.
Stay in a script-enabled region to do all of the following:
Inventory, right-click the item → Edit, and while it is in Edit, go to
Build menu → Scripts → Reset Scripts, or
Build menu → Scripts→ Set Scripts to Running).
Inventory > Current Outfit folder, and see if you are wearing any HUDs you were not aware of. (Note: HUDS do not necessarily have “HUD” in the name.) This could include temporary “Experience” HUDS that you may not be aware were attached.1)
Inventory → Right-click → Detach from Yourself, then
Inventory → Right-click → Attach to HUD, and choose an unused point.