Scraping a table without getting duplicates?

I keep having issues scraping a table that has the first 3 columns fixed whilst the rest of them are able to move (The selectors are different for a single row because the first three columns are fixed, so it appears as though there's two tables in the element selection when there's really just one). Every time I export my data I get duplicates, and I don't have this issue with any other table, how do I stop this from happening?
I would provide the sitemap and URL but the site is password protected anyways so it wouldn't really help.