Menu not working on smarthphone and tablet

Hello,
First, I would like to thank you, I really love your (great) work !

I’ve installed the last free version of Balanced Blog (1.0.7) on my WordPress website (Up To Date : 5.1.1–fr_FR), but the menu is working only on computer, it doesn’t work with smartphone nor tablet.
I’ve tested on different websites with your theme, I’ve disabled all plugins, but the menu doesn’t work (even when I use the preview feature of WordPress for mobile view and tablet view).
All is working great with any other theme, so I guess this is a Balanced Blog bug only…

Can you reproduce this bug ?
Do you need more information ?

Thanks for your help, and have a nice day !
Best regards