The rectangle tool is broken since the last update.
Anyone else experience this? When I choose the rectangle tool, instead of a rectangle it draws a circle/ellipse (it behaves like the circle tool).
I'm on windows 10. Krita version 4.2.7.1

I think you have set the radius in the tool options to the full value. Try setting them to 0.

LOL
So silly of me that I didn't think to check that.
That's what it was, thank you.