Libreoffice cannot preserve content format

I tried to convert multiple pages of the .rtf file to a .pdf file and noticed a format change in the output .pdf file. The .rtf file contains summary tables without borders. These borders are misaligned in the output .pdf file. Does anyone know how to resolve this issue?

The invisible table borders are misaligned? How can you tell? Can you explain in a bit more detail what the problem is?
Can you post a small anonymised sample rtf file in which the problem arises?