For now, I can't see any open investigations or alerts about font issues in the bank register.
This can be caused by too much cache in the browser that you're using. Follow these steps on how to resolve the issue:
Use an incognito/private browsing session and log back in to QBO. Follow these keyboard shortcuts to quickly open an incognito session:
Google Chrome Ctrl + Shift + N
Mozilla CTRL + SHIFT + P
Microsoft Edge CTRL+SHIFT+P
Safari Command-Shift-N
Then, go back to your bank register and check if that resolves the issue. If everything looks fine, clear your browser's cache and temporary internet files.