Zoho Analytics vs Zoho Campaigns - Inconsistent data

Zoho Analytics vs Zoho Campaigns - Inconsistent data

Hello,

I've run a few Campaigns via Zoho Campaigns (different Distribution Lists). I had a few Unsubscribers. 
I've tried to use predefined Zoho Analytics report - Unsubscribes (Zoho Campaigns) to get an exact list of names for all the campaigns run. However, from what I see, it shows me a different number of Unsubscribers from Zoho Campaigns (direct check). 

The same applies to a few other reports - data is inconsistent. I did synchronization before comparing the numbers.

Could you please explain what are the rules / filters used by i.e. Unsubscribes (Zoho Campaigns) report?
Why it is not showing the same data as Zoho Campaigns? Differences are huge (not 2-3 people).

Regards,
PJ