Comment 5 for bug 1445980

I have been lately suffering from this behaviour in one installation which seems to be related to the unpinned icons. When running:

plank --preferences

And deactivating the "Show Unpinned" option the low quality elements are not shown in the dock but new instances of the applications shown are not attached to the fixed icon.

I can confirm that in my case this is not an issue related to non-elementary OS applications as this is happening with pantheon-terminal, scratch, shotwell, geary, etc.