Within the 'last' panel of CloneDVD, where you choose the output mode, record speed etc, there is the DVD title text box.
At some point in the past I manually typed in a title name, replacing whatever text was automatically extracted from the original DVD.
Now, if ever I burn a DVD without any title, then my manually entered DVD titlename appears. A DVD with a title is fine, but if any subsequent DVD without a title is inserted, once again the manually entered name is there by default.
If I change the title name, then this new name becomes the default for every titleless DVD I insert in the future.
This looks like a simple bug where the title name variable is not being cleared before the next DVD title read.
Hopes this helps in the ongoing battle against the bugs.