Unfortunately, fonts and font foundries are idiosyncratic that way. One may draw a font and give it a font weight of 650 or 750 and call it "bold" while others call weights with 700 normal. The font engine and browser determine the mappings from numeric weights to descriptive terms and not everyone agrees. Qt has its own. Most times the definitions are similar and things work but sometimes not. It was worse in the old days when font metric info was stored in a second file.
If in doubt on Linux, fire up FontForge to get a full readout of what the font metadata and metrics actually say.
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