This is a known issue. I suggest using the appearance tab to insert the graphic object into the popover button.
For More Information see: Popover-close blocked by foreground object
This is one of many acknowledged bugs that can be found in the Known Bug List thread here in the Report an Issue section of the forum.
It can also be downloaded as a database file from: https://www.dropbox.com/s/jt09b82i0xijbu3/FMP%20Bugs.zip
Thank you for your post.
As mentioned by PhilModJunk (Thank you!), our Development and Testing departments are aware of this issue. I have attached your post to the original report. When there is new information to report, I will post again.