Duplicate shortcuts keep returning (Settings>Keyboard>Text)
For a while now I am encountering a very strange issue on my iMac (Yosemite 10.10.3):
In System Settings > Keyboard > Text, duplicate suggestions keep returning. See attached screenshot: e.g., there are 3 entries "lg", or 2 "mfg", "sg" and some more duplicates in the left column; each of them with several different replacement suggestions in the right column.
Of course, I have (several times already) deleted those duplicates from my iMac and only kept those I wanted to keep. However, the duplicates always keep returning after a while, and I have not the slightest idea where they come from. 😟
I was guessing that these replacement suggestions might get synced across from other devices via iCloud. So I checked all my iCloud connected devices: iMac, iPhone, iPad, and a second iMac. I found that - very strangely - test entries get synced over from iPad (Settings > General > Keyboards > Shortcuts) to iMac and vice versa; but not my iPhone. And - to make things even more confusing - those duplicate entries shown in the screenshot don't show up anywhere else than on my iMac!
Any idea what's happening here and what I can do to solve the issue?
iMac, OS X Yosemite (10.10)