If the actual cut does not match the preview:
then the problem is as @gdon_2003 noted an electro-mechanical issue with the machine.
Note that there is a troubleshooting video:
Per the machine operating checklist: https://my.carbide3d.com/faq/machine-operating-checklist/ , the basic points of adjustment for a machine are:
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(for belt drive machines) Pulley set screws — verify that these are in-place and secure — be sure to check all axes/pulleys (including Z on machines w/ belt-drive Z-axis, for an HDZ, check both coupler screws).
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(for the SO3/4, X- and Y-axes, and the belt-drive Z-axis on Launch and summer 2016 SO3s) V wheels / eccentric nuts (per assembly instructions)
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(for the Pro, Pro 5, HDM, and Z-Plus and HDZ Z-axis) Lubrication of the linear rails:
https://carbide3d.com/hub/docs/maintenance/
and the video
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(Z-Plus Z-axis) the lead screw on the Z-Plus is a potential wear point and should be checked to ensure that it holds the Z-axis in position securely — also, there is an anti-backlash spring — make sure that it is properly tensioned so as to reduce backlash
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(for belt drive machines) Belt tension (see the relevant step in your instruction manual, Note that the X-axis motor is held in place on standoffs and if those bolts are loose this can cause belt tension issues. Also, belt tension for the Y-axis stepper motors needs to be even/equivalent on each side — a significant difference can cause skipping on one side eventually resulting in lost steps on both.