Unable to use basic landscape blueprint brush

Hi all,
brand new and trying to follow a basic landscape tutorial. As in the video below, my default landscape brush blueprint causes a weird half cave/hole shape instead of the intended pyramid. I thought perhaps it is sitting to “low” on the Z axis but that doesn’t help either.
Any tips? Can’t get very far :D. Restarting/starting a new project does not help.

Thank you

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I have exactly the same problem. I have not been hable to find a solution.