Small problem with included dock..

Does anyone else's iPhone have a message pop up when it's charging on the included dock that says this accessory is not supported or something like that and asks if you'd like to turn on Airplane Mode. I already tapped out of the message or else I could give you the exact error. When I press no to airplane mode it just goes on charging like normal..strange.

I got that message when I tried putting my iPhone in my monitor's built in iPod dock. Apparently there must be something different about the iPhone's dock, because now I have 2 sitting right next to eachother, one for ipods and one for my iphone. yargh. That definitely shouldn't happen when you put it in the dock it came with, though.