Sorry to tell you this, but they are still there after the newest update...
I think I have an idea when they occur though. I think the install icon gets stuck when Mitch is still open during the installation.
I've tested with the newest update by having Mitch installed on both my phone and tablet (both have experienced the bug in question). On my tablet I closed Mitch entirely down during the installation, and no new icons had appeared afterwards. On my phone I simply had Mitch open in the background (so not even open on screen) and there's a new icon stuck there now.
By the way, when I choose "cancel" for these stuck installations, Mitch crashes (as in it simply closes the app). Something I forgot to mention.
Do you think I should just uninstall and reinstall Mitch? Or should I keep it this way for further testing? So far it's not that big of a problem after all.