In my Needed Binder I have about 20+ cards in there that I didn't put in. I can't see them when I go into the folder, and clicking on the card from my private page to remove it from my Needed list manually doesn't work.
It's messing with my head! Any ideas on how to fix it? Is there a way I can remove all cards from the binder at once?
You can delete whole binder in the binder settings. You can get there from Magic Binders list in edit mode (apparently while blindfolded, so good luck). Blindfolding shall be removed in 4.6, lol.
Before deleting, try changing the sorting.
But, if you delete the whole binder, it no longer is an option in the list of binders to add cards to.
Yes, what did you expect lol?