Version changes borders of table

[Anderflash]

I have a document with one version inside (File => Versions).
One version has a table formatted without horizontal borders (only vertical).
I saved this version inside a document that shows another text.
I close the document, the Word and after I opened it. Sometimes, when I open
the version, it looks good. But sometimes the table stays with all the
borders.
Why does this happen and how do I prevent this?

Thanks for the attention.