4" square comes out 3.850"

Does anyone know how to adjust this? I had done it before using an old GRBL home DIY machine but I havent done it on the onefinity. I’ve had my machine for about 8 months. I just put on a new spoilboard, checked square / trammed and everything looks good.

I did the diamond/circle/square test and everything is slightly shorter than i drew it up.

square = 4" , reading 3.850"
circle = 3.5" reading 3.480"
diamond = 2" reading 1.990"


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Does the toolpath have the bit cutting on the vector line instead of outside the vector line?

What software are you using?