Your comments

Thanks for reaching out. I've added that set to our list of sets to add. We will add that full list in the next few days.

Sorry for any problem.  You should be able to change the quantity on any item in your collection. If you have an entry for a card now, you can view it in your collection and increase the quantity from 1 => 2.  Etc.  

Thanks for reaching out. I've added that set to our list of sets to add. We will add that full list in the next few days.

Thanks for reaching out. I've added that set to our list of sets to add. We will add that full list in the next few days.

Thanks for reaching out. I've added that set to our list of sets to add. We will add that full list in the next few days.

Thanks for reaching out. I've added that set to our list of sets to add. We will add that full list in the next few days.

Thanks for reaching out. I've added that set to our list of sets to add. We will add that full list in the next few days.

It fixed itself.  This should be resolved for most users a few hours after they delete their collection.

Sorry for any confusion.