Recently, I changed the title tags for a site that I work on SEO for. See the changes made:
Previous title tag: Flat Fee Listing in MLS, Flat Fee MLS Listing For Sale By Owner.
Revised: Flat Fee MLS Listing | Sell Your Home for a Flat Fee
Shortly after this change was made, the site dropped from a #1 ranking in Google to #2 for the search phrase "flat fee MLS". The site owner insists the reason is because we removed the second "MLS" term from the title tag. While I know keyword density is important within your site content, I've not heard of it being critical within your title tags.
Any opinions out there? Could removing the 2nd occurrence of "MLS" from the title tag have made a difference in our ranking? Has anyone proved this to be the case within their own site experimentations? Please advise - I either need to prove this guy wrong, or correct my error.