Hello,
It looks more than weird that the cart content will affect the font of your menu.
You gave a private link but it is not possible to access the website ; so unfortunately, we are not able to take a look. Which mean that we can't provide you any further detail.
All I can tell you right now is that you need to analysis the CSS rules to understand what is going on :
www.hikashop.com/support/documentation/1...the-display.html#css
Regards,
Jerome - Obsidev.com
HikaMarket & HikaSerial developer / HikaShop core dev team.
Also helping the HikaShop support team when having some time or couldn't sleep.
By the way, do not send me private message, use the "contact us" form instead.