MacBook Pro shows question mark boxes after update

After the most recent automatic updates on my MacBook Pro, there are boxes with question marks versus text appearing within some sites (not all - maybe 50% of them), links, and search boxes. I have restarted my computer, deleted all browsing data, and restarted it again, but this did not fix the problem. Can someone please help me understand why this is happening and what I can do to fix it? Please know - I am not a techy so layman's language and guidance is needed. My software is Sequoia 15.7.2.