Preview shows out of the area

when i preview my work it shows the laser going out of the rail area and when i try to cut my laser keeps running into the rails please help

Have you tried moving project away from the sides?

yes i have tried everything if i try to do a project it runs into the sides

Can you get us a screenshot of the preview and the design with layer settings visible?

It may be overscan combined with a large design and high speeds. Overscan is your friend, but will limit usable space to some degree.