Collections search and load more does not work

Hi, I love the website, but after year adding models to my collections, it’s hard to manage.

I have created a few more collections to separate and classify it a little more, but unlikely it is hard to do that since when I try to assign a model to a collection I can’t find it.

the show all, load more does not show all, and even by search, typing the full name I can’t find it. even worst, using the full name and creating a new collection it tells me that I already have a collection with that name.

Please see the picture

Thanks!