Wow!
I versioned down the “theme” CSS, which I hadn’t tried, and it fixed it!
Thanks for the great advice!
By the way, can you ask what class of CSS is involved in this Arrows?
I would like to fix only the relevant part without versioning down the theme if possible.
Thanks for your quick comment!
I thought so too and tried the following
1) Disable all plugins except “Pretty Google Calendar”
2) Lower the WP version
3) Install “Pretty Google Calendar” on another WP site
But the situation did not change…
Do I need to “remove” unnecessary plugins instead of disabling them?
Any other ideas would be appreciated…