Similar Observation of mine.
Using Ubuntu 16.04.1
I had Clicked on FireFox Browser in Workspace 1
Mouse cursor showed as processing & back to normal.
Browser Didn't got opened & Hence Tried clicking Multiple Times.
Still same.
When Switched to Workspace 2, I found that multiple FireFox Browsers were opened.
This is Bug & really needs the Fix.
Observed with Multiple applications. Some opens in correct Workspace & some opens in other workspaces.
Similar Observation of mine.
Using Ubuntu 16.04.1
I had Clicked on FireFox Browser in Workspace 1
Mouse cursor showed as processing & back to normal.
Browser Didn't got opened & Hence Tried clicking Multiple Times.
Still same.
When Switched to Workspace 2, I found that multiple FireFox Browsers were opened.
This is Bug & really needs the Fix.
Observed with Multiple applications. Some opens in correct Workspace & some opens in other workspaces.