This has been posted on the Wordpress Support page for this plugin also, hoping the Author knows whats going on ?
https://wordpress.org/support/topic/retrieving-the-username-in-wordpress-is-incorrect/

When the system is retrieving the user name, is not collecting as original

Here are the example links to images below:
http://prntscr.com/h315qc
http://prntscr.com/h31686
http://prntscr.com/h316pl

Im guessing somewhere the code needs to be changed, as this is your script only you know what needs to be fixed

Please help on this update or tell me what i need to change on line 47 in the image to correct this issue ?

Thanks in advance

Jason