why I have different number of atoms in I-Taaser pdp then the online pdp

Hello Dear,

How are you?. I hope you are doing well.
I have a question please, I am trying to compare between 2 pdp file, One I got from protein data bank websit and the other one from I-taaser software both of them for the same protein. But I do not know why I got more number of atom from I-TASSER one . I tried to remove all water atoms but the number still different. I am attaching some of them to have a look.
Thank you very much in advance for your time and your help.
Your feedback is highly appreciate it.

Best regards,
Shada