BI Publisher Table formatting getting lost when RTF is re-opened

Hi,

I am creating an RTF with lot of formatting and uploading the same to BI Publisher. It works well and shows the output with the formatting intact.

However, when I re-open it the next day to further make changes, all the table border formatting is lost. Can you suggest any way how this can be avoided?

This is causing lot of re-work because inconsistently, it chooses to wash away all the table border formatting.

Eg: I remove the border of a table, save it and close. Output generates correctly via BIP.  Once I reopen the RTF Template, borders reappear.