Interesting! Thanks for letting me know.
It is working fine with Chrome and Firefox for me, but I’m on macOS (thus the Safari observation). Are you on Windows, Bhagpuss?
I’m going to have to test on my wife’s Windows box now, I guess. Browser vs site compatibility issues: you’d think we were back in the 2000s š
EDIT: I should clarify that the sidebars only appear on the ‘main’ blog with the post listings, not on individual posts