And this is what it looks like in browse mode. The blue button is not inside the portal.
Enter layout mode
Drag the button totally way from the portal and release the mouse button.
Then drag it back, being careful to place it completely within the borders of the portal row.
Then click to select the portal and tap an arrow key to nudge the portal a few pixels in one direction or another. The button should move when the portal moves.
If it does, problem solved.