That wouldn’t be the proper place to put it, because it’s not an issue with the website itself. What qqtt said was correct: there is no real place for you to report such issues. You’re always welcome to touch up gear that’s not compatible with current Roblox updates for your own purposes.
If there’s an issue regarding gear that breaks either it or your game, that’s a Bug Report that’s worth mentioning. Anything else, such as incompatibility, is more of a side issue. Take a look around - you’ll see a lot of gear that’s in the same state as what the OP posted.
I wouldn’t be concerned too much with trying to publish fixes to Roblox gear. Alternatively, as much as gear has been proven to be useless and untouched nowadays outside of a cosmetic item, you can incorporate scripts inside your game that gives people certain benefits for owning gear. For example, @TheSteelEagle’s Monster Islands game gives you some weapons, enhancements and whatnot if you own a gear on the site. This is a good use of gear in which you give it a chance to shine whereas Roblox does not.