Student Names

Hello,
I'm having a problem when I have students that have the same name, in different classes. I teach ESL in Korea and many students will choose the same English name as each other and often they have the same last name as well. My problem is that if I put in Student A and then Student B, Student A gets replaced by all of Student B's information. Is there any way to prevent this? Am I missing a step when I put in my students' information?
Thank you!

Hello,
Please disable the 'link' option shown below and you will avoid this issue.

Regards

The problem with that is, I also have the same students in different classes, so I need those students to link across classes. I don't want to have to enter their information again for each class.
I appreciate you trying to help me. Thank you.