WPBakery won’t update pages

The icons for editing my pages have disappeared in WPBakery (see screenshot). I can still click to edit on the square where the edit icon used to be, but now I can’t save any changes.

I’m on version 6.2.0 of WPBakery and Highend 3.6.6.1. I’ve also noticed the icons have disappeared from the top bar of my site header, not sure if this is related.