Reasons For Last Viewed Home Dashboard To Not "Stick" After Selecting Another Module

After accessing the "Home" button, I use the Dashboard Selection list (from the Home dropdown) to select and view another dashboard. I then navigate to another module, say Opportunities, and then I want to go back to the last Home Dashboard I was just viewing, so I hit the "Home" button/module again. Frequently, the last dashboard I was viewing does not show, but the one I initially was viewing under Home shows up. I thought I would always see the last Home dashboard I was viewing when I access the Home button/module again. 

Has anyone else had this issue of the last Home dashboard not "sticking"?