Why do I have two different mail out dates under School Designations?

dg404

2+ Year Member
Jul 16, 2015
25
2
Status
Pre-Dental
Question. Why do I have two mail out dates under school designations for all my schools? First mail out date says 08/21/2015 and there is a second one right underneath that says 08/28/2015
 

jaymaster7

5+ Year Member
Jun 23, 2013
233
146
Status
Pre-Dental
same here but I guess we have better things to worry about than two dates
 
OP
D

dg404

2+ Year Member
Jul 16, 2015
25
2
Status
Pre-Dental
Im not really worried about, but would just like to know what it might mean.