Slider doesn't show up in article, only shortcode is visible (Joomla)

If you put a slider's code, like smartslider3[148] into an article, and you can't see it turning into the slider, only this smartslider3[148] is written into your article, then you have some extension changing your article's code. You should go to your Extensions -> Plugins, filter out the system plugins, and move the Nextend2 Library and Nextend Smart Slider 3 plugins higher, maybe into the first position, which would make our shortcode to slider changing sooner, before anything else would change it.