Please edit your Original Post (“OP”), above, and report:
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Computer device and its OS version number
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Brave Browser version numbers
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Are there multiple installations of the font, on your computer?
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Where in Brave Browser windows, do you see the problem?
Try to learn of any font conflicts. Sometimes, there is another font, that might be involved, as a layer - under/over - and so, you do not see the font of interest.
Happened with a conflict between Arial and Helvetica neue - take a look at the following issue / topic and its replies:
‘Brave browser displaying thin fonts’
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Possibly related:
Weird Blurry Fonts when Brave Shields Enabled’
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