Hi Olga,
I have done more intensive testing and it proves that the issues is on the theme side. I have deactivated ALL Plugins and the issue still persists. Yet, as soon as I switch to the basic theme, everything works as a charm – https://staging-funfashion.kinsta.cloud/brand/elisa-cavaletti/
The issue is NOT ONLY on the BRANDS pages, but on ALL SHOP Pages, except the category pages.
Please look into this in more depth and let me know if anything needs from our end to resolve, this is VERY CRITICAL, we can not upgrade the production until this is fixed.
I have left the default theme activated on the staging site, but you can switch back and worth if needed.
Thank you!