Hi Joan,
I looked at it as well in several different browsers including ie9 and they all look fine. If this is an intermittent problem they're tough to track down.
Run your site through a validator
validator.w3.org/ You will get a lot of problems showing up. But the only way to do this is to make sure everything is clean as a whistle.
There are two possible sources for the problem. One being the template the other being add-ons running in IE9. Try running IE9 without any addons and see if it fixes it.
If you purchased the template, you should try to get some help from the developer. They may not even know there is a problem with the template, or they do and they already solved it.
Let us know how the validation goes. There is more than one validation service on the web. I tried looking for one that specifically checks for IE9 validation, but didn't see one right off.
Hopefully your client will understand the IE9 is new and all the problems and solutions haven't been discovered yet. It will be a while until all the problems are discovered and it starts working like other browsers.
Cheers,
ed