Sorry I skimmed through the topic too quickly. Just opened up the project to take a look. A few things I noticed will smooth this out.
Move the trigger interaction to the FAQ base and apply the interaction to all elements with that class.
The inside the show and hide interactions, apply the animations to all children elements with that class.
Also it would be good to show/hide the button as well. You could also create a “show less” button that reverses the show more interaction.
Below is the result. The key is that the trigger needs to be a parent or sibling of the elements being affected in order to isolate the interaction to just one of the collection items.
