when you delete items with a red Blueprint with filters, Ghost Items which would match the filter aren't deleted.
(I had to build my modular Trainstation-BPs like that in 0.15.13, caused by the non functional right klick issue

For Retry:
Use a bigger blueprint and don't have all items with you, then delete items with a filtering blueprint (whitelisted).
The problem is, that you have to delete several times, caused by instantly building robots who get the items and build one ghost to that item instantly.