Board Thread:Support Requests - Getting Technical/@comment-27729796-20180210105208

This morning, one of our CMs discovered that a recent edit to one of our pages had caused the tophat to recur throughout the page, overriding other templates. This is the page: http://danganronpa.wikia.com/wiki/Love_Across_the_Universe:_Dangan_Salmon_Team

This is the edit in question which broke the page, adding the Featured Article template. User:Monollama did not edit anything else, the other edits on this page happened on their own: http://danganronpa.wikia.com/index.php?title=Love_Across_the_Universe%3A_Dangan_Salmon_Team&diff=240666&oldid=238864

The template which is recurring is: http://danganronpa.wikia.com/wiki/Template:Spoiler_Page

The template which was added is: http://danganronpa.wikia.com/wiki/Template:Featured_Article

Template: Spoiler Page overrid our "template:imp" and "template:thought" templates, which are simple text-color spans http://danganronpa.wikia.com/wiki/Template:Imp http://danganronpa.wikia.com/wiki/Template:Thought

After reverting the page to before the featured article template was added, I attempted adding the featured article template again, and the issue reocurred. I tried removing the Spoiler Page template, and even without the Spoiler Page template on the page (in Preview), the issue reoccured. It seems the issue occurs if ANY edit is made to the page. I cannot replicate this issue on any other page which contains Spoiler Page & Imp/Thought, such as http://danganronpa.wikia.com/wiki/Hotel_Kumasutra

I'm not sure if there's something that isn't closed, or some other issue. I genuinely can't see any issue with the templates themselves - they're pretty simple, and they haven't been edited except by me after discovering the problem to see if I could figure out what the issue is. We've been having issues with our tophats for weeks now out of the blue but this is a very isolated one whereas the other tophats broke every page they were on and it was a simple fix, wheras this one has me stumped.

I'd appreciate if someone could take the time to help me figure out this riddle! I'm sure the issue's something very simple but I just can't see it. Thanks. 