STRUM bug - not all amino acids in the output file

Dear all,
I've been using STRUM to obtain distributions of ddG values for different conformations of a single protein. As input, each time I give STRUM a PDB file and I select the systematic mode to obtain ddG values for all possible mutations.
I noticed that STRUM's output (final_ddG_1.txt) included only 211 of 214 amino acids for one of my input PDB files (conformation #10), whereas this problem did not appear for other conformations (e.g., conformation #9). I checked my original PDB files and they both had the same 214 amino acids.
The links to STRUM's results are the following:
http://zhanglab.ccmb.med.umich.edu/STRUM/output/SM101286/- Conformation #10
http://zhanglab.ccmb.med.umich.edu/STRUM/output/SM101283/- Conformation #9
Please let me know if you need any other information.
Thank you in advance,
Dimitrios.
https://zhanglab.ccmb.med.umich.edu