Size discrepancy between 600 and 500 weights at 12px size (Webfont, WOFF2)

[adrianfrst]

With weights SemiBold 600 and Medium 500 on the same page next to each other, there's a clear difference in size when both are set at 12px. It's like the 500 is a pixel taller:

Changing the 500 to 400 and it's fine:

It's also fine at other sizes, 13px:

Demo: https://codepen.io/adrianfrst/pen/ZEqdygL

Mac OS Ventura 13.4. I'm using Barlow from Google Fonts, but the same happens with WOFF2 files from this repository (both main and 1.5 branches). Same behaviour in Chrome and Safari.

Any ideas? Thanks!

[jpt]

I will take a look, sorry for the slow response