Vue website works only in developer mode

Hello.
I have Gridsome(Vue) website deployed on netlify and it works only when I set developer mode on in cache settings on cloudflare.

http://pve.com.pl

Without developer mode enabled when I click any link nothing happens. Website can be accessed too on netlify subdomain pve-website.netlify.app where everythik is ok.
Clearing cache do not make any changes too.

Does anyone know what is wrong?