SO3 skates about an inch during project

Definitely I am new to CNC. I tried to cut the same design 3 times. Once it was fine. However twice it just skated off by an inch resulting in a mess. Please see picture below.

Quite frustrating after 3-hours of cutting. The job is tightly secured and has not moved at all.

Thanks in advance for your help!!

If you the pic is same orientation as cut you are losing X position. Check your set screws and belt tension.

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To illustrate what @gdon_2003 mentions:

https://docs.carbide3d.com/shapeoko-faq/shapeoko-3-how-to-check-the-pulley-set-screws/

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