We are still in pre-production, so unsure if this makes a difference, but...
When all grids load on our website, they layout incorrectly for the first second or so, then change layout to layout correctly. It's very noticable. I have included an example video in a secure note.
It's like it's putting the grid on the page, displaying it, then formatting it after that.
Please get back to us ASAP about this.