Same problem here, I just found out where the problem is.
1. Open dante/swift-framework/page-builder/builder/shortcodes/tabs.php
2. find line 25 :
$output .= "\n\t\t\t" . '<div id="'. preg_replace('/\s+/', '-', $id).'" class="tab-pane load">';
replace with:
$output .= "\n\t\t\t" . '<div id="'. preg_replace('/\s+/', '-', strtolower($id)).'" class="tab-pane load">';
I dunno this solution is correct or what, but it works fine on my site. Hope it was useful to you and sorry for my bad english.
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