The Button Group shortcode is a wrapper around several Button shortcodes that you want to display as a unit.
In order to make the border radius work, do not use line breaks between the shortcodes.
[bsv-button-group][bsv-button style="primary" size="" link="" target="_self" tooltip="no" outline="no" customtextcolor="" custombgcolor=""]1[/bsv-button][bsv-button style="primary" size="" link="" target="_self" tooltip="no" outline="no" customtextcolor="" custombgcolor=""]2[/bsv-button][bsv-button style="primary" size="" link="" target="_self" tooltip="no" outline="no" customtextcolor="" custombgcolor=""]3[/bsv-button][bsv-button style="primary" size="" link="" target="_self" tooltip="no" outline="no" customtextcolor="" custombgcolor=""]4[/bsv-button][/bsv-button-group]
[bsv-button-group styles=""]your other bsv-button shortcodes here[/bsv-button-group]