Its not the fault of the plugin. It is due to your site’s CSS properties. On inspecting the toolbar the irregular appearance is due to the CSS of your site. The lines are due to the tables of your site.

No problem with the plugin.

Also, shortcoder plugin is designed not to insert temporary javascripts.

It is aimed to insert “Advertisements, RSS feeds, Maps, Youtube videos etc …”

I think you are misusing the plugin. This plugin has a very very heavy usage and advantage.

See “Example 2” in this documentation page

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