Hi Martin,
- Do we talk about Modules used inside Page (using Module addon) or in general in Template Module position?
- About what kind of modules we are talking about: SPPB modules, Joomla core modules, extra installed modules?
- SPPB Addons =/= Modules (I hope that is clear).
From what I have seen in source code:
- Module breadcrumbs - was disabled by Custom CSS
- Module "popup" (WhatsApp) was partialy disabled by class is_hide
- Whole sidebar-right was hidden by Custom CSS , somebody used that

And this is not from SPPB!
I see normal page with addons, no weird gaps.