Printing to pdf, paper size changes after I select print.

Printing my file to pdf:  I change the paper size to 11x17, select file>print, change printer to Adobe pdf and select print. The paper size then changes to 44x34 which to begin with isn't even an paper size option. I have a work-around where I cancel this print in the window where it asks where to save the file, then I change back the paper size to 11x17, repeat the process and it prints fine to 11x17. The work-around doesn't cost me much time but it would be nice to not have to go through this process every time. Any guidance greatly appreciated.