Why there are slight difference of total users in GA?

I found out that there is a slight difference in number in total user as below, but why is it so? At here Users show 1015, new user 867

But here, it shows returning visitor 234, New visitor 867 where the total should be 1101

From the pie chart given, by calculating the total, the number of users should be 1101 instead of 1105, hope anyone can help me to clarify this.