I'm somewhat new to Civil 3D 2013 and have never encountered this problem before. I've got a top slope standard breakline (dark green line) and bottom slope standard breakline (light green line) with the highest elevation for the top slope at 72' and it gradually slopes down to about 54' within a 75' span. My problem, as you can see in the screen shot below, is I am getting 54'-59' elevation contours right next to a survey point with a 72' elevation whenever I hover my mouse over one of the contours. There are no nearby points with anything near 54' even outside of the surface boundary (shown in magenta). I'm sure this is an easy fixed, but it has stumped be for the past couple hours.
As far as I can tell from the screen cap it appears your top slope breakline is dropping down to elev. 54.XX near the 72.00 point and the TIN has a very steep face between the 54.xx and 72.00 elevation. Take a look at your TIN in an isometric view or 3D orbit and look for a steep face in that area. Of course you 'll need to adjust one or the other to eliminate the steep face.
Neil Wilson (a.k.a. neilw) Infrastructure Suite/C3D 2013, LDT 2004, Power Civil v8i SS1 WIN 7 64 PRO HP Pavillion h8xt, i7 2600, 12 GB RADEON 6450, 1 GB http://www.sec-landmgt.com