Got two models from one protein sequence

Dear I-TASSER Server Team:

I submitted the sequence of a protein to I-TASSER, and got two models attached to the email back from you. I was wondering why there were two models. I am not an expert in structure, and I couldn’t tell the differences between the two models from the two pictures. Could you help me and tell me the differences between the two? Thank you very much!

The job id S118071. The complete results including coordinate files of the models:
http://zhanglab.ccmb.med.umich.edu/I-TASSER/output/S118071