Trying to get current user's manager name in a text box, but data is wrong (Infopath related)

Greetings,

I have an issue in Infopath where I'm trying to display the currently logged in user's manager name in a text box. however the info that appears inside the textbox is i:0#.f|membership|managername@domain.com

I have a textbox that displays the currently logged in user. Now I want to do the same but with their respective manager's name.

Anyone had this issue before? If so what solution or workaround helped to solve it?

Thanks! 

P.S: I tried looking for infotpath forum, but I was told to post here regardless.