OneDrive asks to "Delete these 13888 items?"

We have MS 365 Family with six users.  

The last few days, in updating one of the PCs with MS 365 Family, maybe two minutes after each restart, I get this message:

Microsoft OneDrive

Delete these items?

Review the 13888 items before they are deleted.

You are going to delete [filename], [filename] and 13886 more items

(Checkbox) Don't ask again for large number of deletes

{Button) Keep 13888 items

(Button) Delete all items

FYI – I opened this OneDrive and looked in its Recycle Bin, and none of these 13888 items is there.  That Recycle Bin is currently empty.

I am not at all sure what happens where if

(a) I do “Keep 13888 items”,

(b) I do “Delete all items” or

(c) I check “Don’t ask again for large numbers of deletes”.

Does anyone have personal experience with this and knows what happens (and where) for each of these choices?

Thanks.