Text align ignores width of glyph

[SinanAkkoyun]

textAlign: right

Somehow this monospace font is not being positioned correctly on textAlign borders.
I assure the width and bearing of every glyph is exactly the same width.
Even when prepending a whitespace it does weird stuff:

I'd be glad about any help, even if it's just a quick incentive on where to look in the source code.

[caramboleyo-no2fa]

Maybe its something about font kerning:
https://felixmariotto.github.io/three-mesh-ui/#font_kerning

[SinanAkkoyun]

That's a good guess, but I already have it at kerning: 'none' and deleted all kernings in the TTF file itself (fontforge)