Recently fall on the problem below:
The quick solution here:
1. Open phpMyAdmin, then go to database table where data come from. Click on structure tab on phpMyAdmin for selected table like below:
2. On the top image you will see on Collation row. Here first_name Collation set to utf8_general_ci and last_name Collation set to utf32_general_ci.
When I have change last_name Collation to utf8_general_ci like below the problem solved.