Blocks only populated when NOT in edit mode

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I have blocks that have no content when in edit mode but have content when not in edit mode.

They did have content and I removed it.

Then published the page. At first nothing showed. Now when I go back to the page the content is back. I can't see it in edit mode so I can't delete it again.

Cleared the cache etc.

I the only way to rename the blocks?


Thanks