I can attest to this. There seems to be a forward slash missing at the end of the url (which the 'go to forum' button does have), which causes it to redirect to the main site.
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Please stop embedding files/images from Discord. Discord has anti-hotlinking logic in place that breaks links to Discord hosted files and images when linked to from anywhere outside of Discord. There are a multitude of file/image hosting sites you can use instead.
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Cave Story Tribute Site Forums
ElecMaw
Thatnamelessguy
Typing "cavestory.org/forums" because I'm too lazy to click the forums on the tribute site also does not work. I'm guessing it doesn't relate to the skin, as I'm using Cave Story Dark.
Random-storykeeper
That's strange because cavestory.org/forums used to work, without the forward slash. It definitely doesn't have anything to do with the skin; I use Argh my Eyes!
Polaris
It looks like it's been fixed now? I noticed this too until recently.