Spoilers are breaking login button

Hello, I am having a problem where if there is a spoiler on a page or in a post then the login button in the nav bar when clicked will just freeze the page instead of making a popup login window.

Login button towards the upper right hand corner of the page
A page with the problem:
State of Exile Podcast

A page without the problem:
Builds

The theme that I am using is: “Oblivion” by Skywarrior themes

https://wordpress.org/plugins/shortcodes-ultimate/