FSlateDrawElement::MakeLines antialiasing

Hello,

ok, first, I’m a noob. Next, I’m trying to render a specific graph with FSlateDrawElement::MakeLines and I’m facing an issue when bAntialias is set to true.

Without Antialias, my lines are as sharp as expected:
Antialias_off.png
When turning Antialias on, it’s no more straight lines, I get random curves:
Antialias_on.png

Any idea of how I could circumvent this?

I meet same problem in UE 5.1.1