Print not fitting on page when previewed

When I create a page size of 14" X 16" and create the artwork to fit on it.as shown below. However, if you see the print preview of same artwork it doesnt seem to fit on the page anymore.

I have tried everything but nothing seems to work.

I always used to print to the DTG printer and this never happened before.

I have two PC's with X5 on and one of them started this, however after opening the artwork in the other PC, the same has happened.

Does anyone know how to fix this. the printer is a Brother GT-3 T shirt printer. But I am sure this will be the same for all the artwork we do.

Thanks for your help in advance

Kind regards

Evrythingprint