Well after viewing your website i could see the ads perfectly. :dunno:
Do you mean under the x10hosting ads you have placed another ad?
Edit:
I see the problem already.. first off what plan do you have? I notice you are running 2 different versions of ads. One is advanced and one is corporate.
The second problem is in order to have one ad not attempt to sit in the same place just ad a <br /> after the </script> this will force the second ad to the line below it.