Ship to address on delivery different than sales order

Hi Experts,

Please help, I have a sales order with a Ship to" address in NY but when i created a delvery shipping address on delivery paperwork printed a different "Ship to" address (NJ address). I checked delivery header data and under "partner function" tab i see partner function "SH" has the NJ address. I checked the sales order and this address is not coming from sales order "partner function". Any idea where this might be coming from??

Also please help me understand "partner function" (SH) and how this is different than ship to. Thanks!