Styling not playing nice with plugins

We are using the spider calendar and the contact form 7 plugins on our site. The pages that we have these plugins on are changing the widths of the page. The plugin’s width itself is working fine but the actual page width is shrinking. This is only happening on an iPhone (that I know of right now). Does anyone have an idea as to what is causing the issue? Styling somewhere maybe? I’ve tried putting a max-width on both plugins but it doesn’t do anything.

One of the pages is here: https://royalrun.org/communications/