One of my staff members pointed this out to me this morning. When looking at the attendance report, it now has the username and email overlapping with one another. The quick solution was to collapse the user-field carrot which ironically hides the e-mail.
When hovering over the names, the e-mail portion under the username disappears. You'll also notice the table is shifted to the right.
I turned on debugging (all the way up) but nothing reported here. Clearly we are using a theme but I cannot test the theme yet in regards to attendance (my test site is on my home pc) to see if the theme is the problem.
In any event, perhaps this is a known issue and worth asking about .
Moodle 3.5.2+, MySQL 5.7.X, Php 7.1.x, and Attendance Plugin 3.5.5 (2018051407).