After I'm done setting my maneuver node the orange dotted line reads that my Periapsis and Apoapsis range around 81,000-83,000.
After I finish my burn my Apoapsis is fine but my Periapsis is always under 50,000m causing my to reenter the atmosphere.
I've tried to get into a high orbit I've succeeded in archiving a high orbit though I run into the same problem.
My high orbit's always turn out elliptical rather then circular.