Nope, because you spent not much information.
- Which OS?
- What version ID?
- PDF export settings?
- Which PDF viewer?
- What zoom factor?
- Screenshot of how it looks in ID, how it looks in the PDF?
How does it look in ID when you are in Preview mode?
not there in preview either
I don't see any difference between your ID screen shot from the Acrobat one. That's said, you don't have borders applied in InDesign.
sry if the question seems dumb but how do i do that ?
You can apply strokes to cells with table styles, cell styles, manual selection of cells and applying a color and a stroke or a combination of all.
The blue lines are only cell border lines that you see during work what you are doing.