aakk9999 - 1:02 pm on Aug 24, 2013 (gmt 0)
Hi Jill and welcome to WebmasterWorld!
Google has been serving personalised results for a quite some time. This means that the SERPs will depend on whether you are signed in to Google or not, what your past searches are, at what location you are based and others.
When you do search for your keywords, do you clear your cookies first? This could be one of reasons why you see a different result on browser you are normally using versus browser you do not use or use rarely.
There is also possibility that your queries could be hitting a different data centre which could result on different SERPs you are seeing.
And lastly, Google has been in the state of flux with constant algo tweaks and whilst some sites do not feel it, others have been affected by it much more.
But more importantly, what does your web site analytics say about your traffic? Do you see any significant drops in your traffic or shift of traffic from certain keywords to others?