Hi @SHELLONPO ,
This is happening as the segments are evaluated against two different periods in both the panels. In first report the segments are evaluated against 2nd March only, in second the segments are evaluated against the time period you have applied at panel level.
If we take a very simple example of below two users,

A segment used to return visitors who viewed "home page" will generate below numbers on 3-Mar,
- Using "last full day" will show 1 visitor for 2-Mar
- Using panel date range as 2-Mar to 3-Mar and fetching Day dimension will show 2 visitors against 2-Mar.
If you change the panel date range in 2nd report and choose only 2-Mar, the numbers in both reports should match.
I hope this helps.
Cheers!