Illustrator exports pdf not exactly in artboard size

Hi,

I want to export my Artboard as a normal PNG in exactly 500x500 with the Asset Export panel.

It always exports in 501x501. I tried every setting. (it happens with jpeg as well by the way)

When i create an Artboard in 499x499 it will export it exactly in 499x499.

May be somebody came across that problem before.

Thanks!