Sync Issue Zoho CRM <-> Zoho Campaigns

Sync Issue Zoho CRM <-> Zoho Campaigns

The sync between Zoho CRM and Zoho Campaigns is currently inefficient.
If you don't solve it, we will have to use another mailing tool, and trust me it pains me a lot.

The issue
When I create a sync between Zoho CRM and Zoho Campaigns, the whole fields syncs perfectly.
However, when I apply updates to my CRM fields, the changes do not appear in Zoho Campaigns during the next daily sync.

Example:
We have a field "Interest" empty during the first sync. I updated this field in the CRM with the value "Finance".
During the next sync, the field is still empty in Zoho Campaigns.

How can we solve that to be able to create specific communication based on our leads information?