If you drop an entity, it'll "fly", and you can't pick it up either, you can only do /kill to destroy the entity.
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Have you tried relogging to confirm its not visual?
Duplicate of MC-134974.

It's not visual, I tried relogging in.

Also, if you're next to an item, it'll soar into the air and land somewhere else like a soccer ball; that's what I mean by "fly".
Is this still an issue in 18w32a?

I haven't seen a similar bug in 18w31a to 1.13.1 release. But's it's not patched or an awaiting response either so yeah....