FROM_UNIXTIME same date time from two different timestamp

I am having a weird problem with mariadb. I am using FROM_UNIXTIME to convert timestamp to datetime. The problem is two different timestamp is resulting to same datetime. How can it be possible?

Here what I got from mariadb-

SELECT from_unixtime( '1456017720' ) , from_unixtime( '1456021320' )

Output on my timezone-

2016-02-20 23:22:00 2016-02-20 23:22:00

Another example:

SELECT from_unixtime( '1456016700' ) , from_unixtime( '1456020300' ) 

Output on my timezone-

2016-02-20 23:05:00 2016-02-20 23:05:00

This is wrong because no two different timestamp should return same date time.

I have attached screenshot proof of output that I got via phpmyadmin.

Version info-

innodb_version 5.6.26-76.0 

protocol_version 10 

slave_type_conversions version 10.0.23-MariaDB 

version_comment MariaDB Server 

version_compile_machine x86_64 

version_compile_os Linux 

version_malloc_library bundled jemalloc