is it possible to have different serps from different datacenters? for example one of my visitors came to my site from the term ' motorcycle parts ' being on page one. when i check it i am on page three. I did see it on page one the other day when i checked google and now its on page three again.
Yes, different results were shown to the searchers based on the query country. For your info, you can target your site to certain country using your Google Webmaster console account