Change logo font in debut creates a weird result

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Hi everyone,

I have my whole store in "Avenir Next" font, and I only need my logo to be in "Memphis medium" (both being offered by the Debut theme). I should be able to change the font with this code: 

 font-family: memphis !important;

or with "memphis_n5"

but they create a weird font which is not Avenir (so something is happening) but it's definitely not memphis...

Anyone has a solution for this? Shopify support team was not able to help me because "we can't add custom font to the theme" but it's not a custom font. A bit stuck here, if you could help me that would be very much appreciated!