Radio button value not being sent to server

Radio button value not being sent to server

This is a general question, thus no script.
I'm looking for hints as to what could cause the following:

Is there any reason that jQuery include scripts could prevent HTML radio button values from being sent to the server while all other values from selects and texts are correctly sent? When using straight HTML the radio values are sent. I get the same results in browsers IE8, FF 26 and Chrome 32.