This new gallery reordering scheme is frustrating and time-consuming, I think we all agree.
But while it's here, you might as well know there is a way to keep your gallery order the way you want it and still add pictures to your galleries, or even whole galleries.
The trick is to have your My Content list already open in a browser tab or window before you actually add anything to your galleries. Make the changes to the items in that list, and then go ahead and add pictures to your existing galleries. Then click back into the tab or window with the My Content list displayed, and scroll down -- or hit the End button on your keyboard if you prefer -- and click on the Save Order button. Unless something is seriously wrong on the IF side of things, this should still deliver a "Successfully saved new order" message, though not as quickly as if you were doing it merely after moving one or two galleries up and down.
Then click back to your Profile page -- or surf to same if you've been away from it for a bit -- and either Reload or wait for the page to finish loading. In either case your Top 5 should match up with what you left behind on My fap>My Content.
If it doesn't, complain here.
BZT