Database doesn't get synced properly

One of my databases which exists on three devices doesn’t get synced properly. I am using iCloud as my sync location. On my main device (MacBook Pro) there are 8096 items but on the other one (iMac 2011) there are only 8007 and on the iPad there are only 8078 items. Any ideas how to set this straight?

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Do note: iCloud could be stalled.