Repeating Reminders on desktop won't stay in sync with iOS
I fixed this.

On iOS I went to SETTINGS > ICLOUD > Turned Reminders OFF, then ON. It warned me that it would delete my reminders.. No big deal as they are still stored on iCloud.

On OSX I went to System Preferences... > iCloud > unchecked Calendars &amp; Reminders ( it again warned me that it would delete them from computer which is okay because they are stored on iCloud) > Checked Calendars &amp; Reminders (to turn them back on.)

It is now working as expected. Weird...