I use Runtastic too and from my understanding (prob limited) of the elevation chart, the black line represents the actual elevation changes of the route and the blue line represents your speed in relation to the changes. It looks as though you kept your pace relatively steady, despite the peaks and valleys (hills) on your course.

As for the actual elevation numbers, I'm surprised that your mile 1 and 2 have zero changes because your graph doesn't reflect it. And for mile 3, you climbed 19ft and came down 26....? Isn't that it? Or perhaps I'm missing something too?

lol, I'd say just e-mail Runtastic or post your question here: http://my.support.runtastic.com/runtastic

good luck