Disappearing and reappearing collection

Logged onto Lightroom Classic and discovered that one of my collections-labeled Instagram had changed.  Instead of the one collection with that name there were 2 collections.  One named Instagram and one named Instagram 2.  I did not do this.  The number of images in each did not concide with the number in the original collection.

I found one image im my catalog that I knew was in the original collection.  I clicked on the icon in the lower right indicating it was in a collection-Instagram.  I clicked on it and the entire original collection appeared.  I deleted the 2 incorrect collections and created a new one naming it Instagram and put all of the images into it.   The next time I logged on the new one I had created was gone and those 2 other ones were there.

Then I created a new collection.  Named it New and put all of the correct images  into it.  When I logged on again my New collection was there PLUS those 2 collections labeled Instagram and Instagram 2.  

Now- those 2 collections both have the correct # of images and in the correct order.  So all 3 collections have the correct # of images BUT I cannot get the images in the New collection to be arranged as the other 2.  The original Instagram collection (including these two are arranged by Custom).

My ? is not just the arrangement of the images but what the hell is going on