Two segment with same filters but different results

I created two segment with same filters but the result was different, I checked it a gain after 24 h and the result was

First Segment: appears 7006 contacts

Second Segment: appears 7136 contacts



What is the reason for that different?

I created two segment with same filters but the result was different, I checked it a gain after 24 h and the result was
First Segment: appears 7006 contacts
Second Segment: appears 7136 contacts

What is the reason for that different?

@escopecz pls your help here?

what filters are you using?

@ninjoan

Filters related to custom fields synced with my website database.

user registered in one of our services or not, last login date and so on

@MxyzptlkFishStix

Can you help me ?

Check Anonymous contacts. In Contacts there is a special button