It sounds like there may be an issue with how the slides are formatted or exported. Some slides might be using a different background layer or setting that isn't properly recognized during the PDF export. Try checking the slide settings or background format for the affected slides, ensuring they’re consistent with the others. You could also try exporting the slides one by one or adjusting the export settings to see if it resolves the issue.
It sounds like there may be an issue with how the slides are formatted or exported. Some slides might be using a different background layer or setting that isn't properly recognized during the PDF export. Try checking the slide settings or background format for the affected slides, ensuring they’re consistent with the others. You could also try exporting the slides one by one or adjusting the export settings to see if it resolves the issue.