Running Groupwise 2014 R2 SP2 (14.2.2) Build 126868 (4/3/2017) and GW Mobility 14.2.2hp1 version 139

I've been getting alot of reports from users that changed calendar events are not syncing back to devices. Especially deleted appointments.
I've tested with a few users - created an an appointment with them from the client, waited till it synced to the device, then deleted the appointment from the client. Sometimes it would delete on the device, sometimes it wouldn't. On both our ends. Same goes for changed appointments. The updates never show up.

Are there any known issues with this or any others experiencing this?