Do you have an object in your Tableau dashboard that should be expanding and contracting but isn't?
There are a number of reasons you might set up an object to expand and contract. Maybe it's a detailed sheet that should only display when the user makes a selection from the summary sheet at the top of the dashboard. Maybe it's a parameterized worksheet swap. Maybe you've set up a simple show/hide button for your user.
Regardless, when an object is in a layout container and isn't expanding and contracting as desired, it's frustrating!