Hi ladarketa,
We are sorry for the trouble. If I heard you correctly, you're experiencing a similar issue mentioned here: https://community.adobe.com/t5/indesign-discussions/indesign-table-grid-lines-disappear-when-exported-to-pdf/td-p/11532875.
If so, could you please try the suggestion shared by our experts here and let us know if that helps? Please also share the version of InDesign and the details of your operating system.
In the meanwhile, I will check with the team regarding this issue. We will try our best to help.
Thanks,
Harshika
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