This concerns a plain new wordpress installation with only SiteOrigin page builder and widgets + Ultra. Unfortunately, I can’t upload pictures easily here.
Anyway, suppose you are making a title page (static front page). Add SiteOrigin Editor and start typing in Header 1 style. Save the page and now go look at the preview (or just the front page of the website). The font type clearly differs between the editor and how it looks on the page.
This discrepancy made me wonder whether there are more of such inconsistencies.