Richard:
In the US ArchiCAD Library 12, there is a Title called "Title with Layout No 12", which looks similar to your title (it would help if you gave the title's name). Under the parameter
Show Drawing Number there is a parameter called
Text Position X which will move the drawing number. If you do not see this parameter, you can try opening the library part and seeing if it is a hidden parameter. If so, you can unhide it, it may have taken a value other than zero (perhaps from injecting the parameters from another title).
HTH
David