Why is my file randomly completely filling in some items

I use my laser to make small batch items for market. normally I will fill most of my work surface up with 2-3 of the same book mark or coaster. here lately I have noticed that some of them are filling the whole item but the same image that was duplicated is not. when I preview the cut it changes each time which one is duplicated. I am running light burn 1.7.08. I have tried uninstalling lightburn and re installing it. im at a lose of how to fix this. i normally do offset fill to make it faster

Please SHOW us your problem. Upload a file and post screenshots (not cellphone pics) of your settings.

You can very easily use the DETECT DUPLICATE command to remove duplicated items, which will cause unexpected fill.or no-fill results.

the ones that are completely filled in change. I don’t believe that would be the case if it was a duplicated layer

bookmarks.lbrn2 (3.0 MB)

The original file looked like this:

Doing Edit → Delete Duplicates produced this dialog:

The result looked like this:

So there are duplicated shapes and they do, as expected, change the result.

In addition, the original file had layers set for Offset Fill:

"Offset Fill is intended for designs with a lot of empty space within graphics

That is definitely not the case for those bookmarks and the intricacies of the design, plus the duplicated shapes, may be producing unpredictable results:

Sometimes graphics with stray nodes or unusual paths can confuse the calculation interminably.

I changed the layers to Fill mode for those examples.

Unless you have a compelling reason to use Offset Fill, you will probably get better results much faster using ordinary Fill mode.

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I also noticed a problem with red cut line.