It’s hard to know how to help without any particulars, but here are some general things that might help. Personally, any time I have a problem the first things I do are the two @marmak3261 mentioned:
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Make sure the material is completely flat against the crumb tray via liberal use of magnets and/or honeycomb pins
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Clean the lenses: https://glowforge.com/support/topic/cleaning-service-and-moving/cleaning#things-that-need-wiping
If those don’t fix the problem, then look here:
https://glowforge.com/support/topic/troubleshooting/cut-didnt-go-through-material