This actually sort of happened before
here. The OP in that thread posted a link with filter=4. I removed it for no particular reason before visiting the link only to find zero balance and older transactions and had to tinker around with the filter to see the new transaction.
I think the OP in that thread experienced the same thing as you judging from their post. The transaction appeared normally a little while after I posted there (about 1 hour after it got confirmed).