Google site: search operator returning conflicting results

http://ift.tt/1yXGbXQ

Based on the above link, I am able to see the indexed pages. However, I see varying results as below.

Are they supposed to return different results based on http protocols and/or trailing slashes as in example below?

site:https://www.desiza.com returns 26,800 results
site:https://www.desiza.com/ returns 21,000 results
site:www.desiza.com  returns 9640 results
site:www.desiza.com/ returns 4290 results

Which version is appropriate version? Thank you