Interaction, hover and pressed state of H2 title not working as it should

I’ve been building a basic one-page site but have run into a frustrating problem on the lower section of the page.

Each of the options (story, process, philosophy and rates) reveals a different block of descriptive text, while its first state (services) shows an additional list of options and further text.

However, once I select any option other than services the unselected state (services_title) ceases to function the way it’s set up to - that’s to say as an interaction that makes the services text appear.

Nor do the hover and pressed states of the services option function as they’re set to.

Oddly these options work perfectly well when my display is set at a higher resolution.

Any ideas?

Here is my public share link:

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