Sometimes, chunks regenerate in a weird way, some chunks regenerate on a different Y axis. The biome looks like a big mess of chunks in different heights...
Every new world that is generated, superflat or normal. Has at least 6 chunks like this in the spawn area.
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Can you post a screenshot?

Here is an example...

When you say regenerate, do you mean that you use the "regenerate" option, or that you create another world using the same name as a previous world?

I mean, I start a completely new world and this is what I get sometimes, not always, but it's like this, it's a lot of it.