That generally means that the latest trainer showing is newer than the one you dloaded. You must have gotten that quite awhile ago as there's only two showing. There's a Steam version from Jan 2008 and a Retail version from June 2010 for version 1.1.
I don't know if there used to be other older ones that no longer show or that you got the Steam version and the Retail is newer than that and may or may not work for you. If you're not having any problems you may just want to keep using what you have.
If neither trainer works, sure, you could report it . Just keep in mind, that given the age of the game, it's no guarantee they can or will be able to work it into their schedule for updating.
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