All my computers show version 2.0.0.18 and never give an offer to update to 2.0.0.22. EXCEPT, my oldest 2 core tower has found and automatically installed(at my prompt) 2.0.0.22. I could go to the site and download it, but I figured maybe this should be looked at. Happy New Year Jeremy. :)
This is intentional. Sometimes minor updates are uploaded, but not immediately pushed to all existing installations. This is to reduce the number of unnecessary update notifications.
Your older system probably had a version prior to 2.0.0.18, which is why it saw an update and then received 2.0.0.22.
Regardless, thanks for the heads up ;).