Issue of slanted 3-D Models

Hi everyone, 

I'm facing another issue of my 3-D models being slanted after the Aerotriangulation. Can some kind soul here walk me through step by step how i can un-slant them, and what do i need to do ? I'm very new to this program and still trying to learn. Attached are some pictures of what i mean: 





Thank you so much for any help you can provide !!