Plotter issues - cutting too large

I am cutting vinyl for street signs measuring 12x18 on a Gerber GS15plus. The 12" dimension cuts properly, however the 18" dimension is cutting at 18.375". We tried calibrating and went through the settings but with the same outcome each time.

We have two plotters, so we tried the same on the other plotter. It too produced cuts that are over-sized. We also tried a different file. Same thing.

Any ideas what it could be?
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