There is a fix. I highly recommend you contact Schneider Electric Technical Support for it. I am hesitant to type the fix in public because it will/may involve manual changes to a table which carries risk.
What version of ArcFM are you currently using?
I'm also curious to see if the system page template is actually showing up in the list of page templates, even for the creator. In the Stored items drop down (with Page Templates selected), there are 2 lists. The top list shows the most recently used page templates. The bottom list shows the actual list of page templates.
My guess is that the creator of the page template has it showing up in the top list (the recently used list), but not in the bottom list. Can you double-check that?