Lowering/sculpting landscape unexpected results

when I try to lower the landscape via the sculpt tool(even by small amounts) this is what happens :

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I went back to 4.24 to test with the same size brush(on a different landscape though) and it works.

I’m on 4.26, any help would be much appreciated.

I’m guessing you’ve tried reducing the brush strength, it has to be set to pretty small values (0.05, 0.2 etc)…