I've got all editing enabled, I created the layer, so I have full permissions on it. But the updates I make to the attribute table of the hosted feature layer only save about 5% of the time. I originally was just updating fields with domains and saw that it wasn't saving properly. I tried updating a simple integer field and saw the same issues. I would end the edit session, open up the pop up for that feature and see the changes. Then I would click another feature and go back to the original one and the changes would be gone?! Symbology based on the updated field was rarely updating on the fly as well.