2 Cell Phones but only one syncs

Hi all,

I may have found a bug.

I have a contact who have 4 phone numbers (1 personnal cell, 1 work cell, 1 work and 1 personnal).
The 2 cell numbers are identified as Cell Phone in Zimbra.

When it sync to either a LG G4 running android 6 or a Samsung Galaxy Note 4 running android 5.1.1, it only displays 3 phone numbers.
The G4 uses Mailwise synchronization EAS 14.1 and the Note 4 uses Samsung Activesync implementation EAS 2.5.

Now, if I change one of the cell phone to "Pager" on Zimbra, all 4 phone numbers syncs perfectly on both phones.

Zimbra 8.6.0_GA_1178 (build 20150618170638)
Zextras Suite 2.0.4