Google Keyword Tool giving conflicting results

I am getting conflicting results in google’s adwords keyword research tool. For example, for the keyword “feelings”, one time it produced a result of 7.4 million but then an hour later it produced 823 000.
These were both global “monthly search volume”.

This same discrepency has happened to me a bunch of times. Any ideas what’s going on here?

i got the same respose from them…it gives me some conflicting results …i have shifted from this to wordtrekker…

Thanks, yes I’ve used wordtrekker also. An excellent tool.