Does anyone recognize shortcode ig_special_heading?

I think the plugin you are looking for is https://wordpress.org/plugins/ig-shortcodes/.

Apparently it has shortcodes that start with ig_ and provides them for things like…

  • Accordion
  • Buttons
  • Badges
  • Notice box
  • Columns
  • Clearfix
  • Divider
  • Google maps
  • Tabs
  • Toggle

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