Variations in Yahoo SERP as per Regions
 

I went into designing a website and launched it lately. Looking at the website, one can easily remark it as SEO friendly where almost all techniques have been implemented. I kept the main focus on content as well as on-page optimization along with analyzing keywords. Keywords were only placed to make it more meaningful and its density was certain. Moreover, link building and social bookmarking were also implemented to gain backlinks for the website. Though, I came across a weird situation where variations in Yahoo SERPS were spotted easily and it all happened on the basis of regions. Can someone provide a solution for it?