Problem with Sync of icloud contacts

Hi, I need help, I really like eM Client as it fits almost all my need. However I do have some issues with the application. Currently I’m dealing with a sync problem of my contacts.
I use Mac on my desktop and iOS on Iphone and iPad. On my desktop I use eM client for contacts, on ipad and iphone the apple contacts app. Sync is via icloud (which works fine with emails and calender).

With contacts I have 3 problems.

  1. sometimes the icloud folder disappears in eM Client and no contacts are shown. This applies to contacts only! Calendars and E-Mails are o.k. After restart of eM Client iCloud folder and therefore contacts are shown in eM client.

  2. in iCloud most of the contacts have a strange addition “SORT-STRING” (mostly in name fields).

  3. In eM Client most of the mobile numbers are shown in “other” instead of “mobile number” after sync. I can’t see a system behind that and I do not know why in some contacts the field entry is correct.

It would be great if I can get help on that. Because in a few days my trial period expires and I want to buy eM Client. But this contact issue really is a mess.