Sometimes when I resize a window in gnome 3 and then switch tasks, the window snaps back to it's previous size. How can I make it retain the size that I change it to?

For instance, if I drag at the sides of a terminal window to make it a new size it will resize, however when I click on any other window the size of the terminal will shrink back to exactly the same size it was before I resized it.

It might only be the terminal window that does this. Other windows I have seem retain their size.