Tsugami S206 making random long parts ?!?!?!?!

Has anyone ever experienced a Swiss lathe making randomly long (like .300 too long) parts ?? this is happening on the main spindle side and is in the middle of the part.... sub side dimensions seem to be good, and most main side ones as well. Diameters are all good, part looks good, just looks like somebody stretched it in the middle !! I'm completely stumped....It's like I finally found the "add-on-wheel" that I got sent looking for as a greenhorn LOL