Grid

Hi, I am trying to make two columns using a grid layout. I use two grid layouts (50%:50%), and then inside the left one I use again two grid layout but this time (25%:75%), on the right side I only use the initial 50% grid layout.
On preview, everything works fine, and the columns are divided exactly as set through grids. However, once when I hit Update, it all gets messed up and pooled to the left.
Can you please have a look? Thank you!