Background white banding appearing but clearing after mobile menu open and closed

I’m having trouble with
(testing on Safari mobile currently)

Having issues with white banding appearing top and bottom of screen, background colour is set for entire page. No other background colour elements present.

Working in
Wix Studio

Site link

What I’m trying to do
Have the background colour be full bleed on each page

Extra context
Screenshots shows page and then when the egg (mobile menu) icon is clicked, and then closed the background goes full bleed afterwards on the page? Seems an odd glitch.

Before menu click:

After menu click:

This is odd! It feels like it’s a bug - would you be able to open a report for it following the steps here - Wix Studio - How to report a bug