Weird console messages involving lvl. 66 items

There is this really weird bug that happens when I click on a level 66 item in shop

I have never heard of these items so I suspect that they are all lvl. 66 items.
But if I click on the winged boots (another lvl. 66 item) it will display the exact same errors.
(But on the flip side, now I know some lvl. 66 item names)