I have a SharePoint Online classic site in which my designated site logo does not appear when normally browsing (there is just a blank space where it should be). However, the logo does appear in the various site settings pages, and also when I edit the page and view that same page's 'Preview' mode.
The site, which I've inherited, does have custom page layouts and CSS and I believe that's where my issue is though I'm struggling to narrow it down, given that everything looks OK on those settings/preview pages.
Is there a particular site setting or Master Page/CSS/ASPX-file that I should be looking at? Thanks in advance.