<human>: I just finished up a graduate degree which cost almost $30k a year and took out loans to pay for it. I am not looking for people to berate me for paying for grad school; it was a professional degree and I will soon be employed in my field. 

I recently received an email from my student loan servicer (My Great Lakes) informing me that I am starting my grace period, which will end in October, so they know I am done with school. My current balance is about $30k. However, neither the loan servicer website NOR the National Student Loan Data System (nslds.ed.gov) show the loans from my second year of grad school, only from the first. At the beginning of this last school year, there was an issue where my school disbursed too much money, which I then returned to them via bank draft, and I figured they would take care of it. The amount from the "mistake" was around $30k, similar to the amount that I would owe. 

Will the amount show up on either the loan servicer website or NSLDS sometime soon? I have a weird fear/hope that the second $30k has somehow "disappeared" due to the earlier issue with the school disbursing too much, although I doubt this is actually possible. Should I call someone about it, or should I sit tight, pay my existing $30k, and expect the rest to appear on my loan servicer website eventually? Will I somehow be screwed over by this? Part of the issue is that I'm having difficulty explaining what happened, because I'm not sure what happened, or who I would call to sort this out.

Can you condense the text into three sentences or less?
<bot>: School cost $60k, only $30k in loans shows up on loan servicer website and NSLDS. Thank you for any advice!