@wanjuki
Thanks for reaching out. The row borders can be disabled in the plugin’s dashboard’s Reference container metabox > Row borders. In the current version, this settings page’s link is at the bottom of the Settings submenu of WordPress admin.
All table borders were removed from the reference container last October when versions 2.0.0 and 2.0.1 were released, as having borders all over the reference container was highly disliked, but row borders may be preferred and have been added on request as an option since v2.2.10 released on last Christmas day.
This option however defaults to No, so probably another admin has enabled row borders on your website this year. Also, an option to choose the border style has not been added yet, while dotted row borders are often preferred over solid ones, and just horizontal borders, not the vertical part. Sorry for having missed out on adding these options.
In case you might be interested: The border below the reference container heading can be removed too, by a setting above that defaults to Yes since the design with a head border is generally preferred.
Thank you for your feedback.