You guys are a tough crowd.
For clarity, we didn't create this forum software, we just customized it a bit to fit within the bounds of our site. We can make slight modifications, but a lot of it is compiled, requiring us to contact the vendor for major changes. To be honest, we're more in the business of making music software, not forum software. We've been reporting issues as we come across them though, and resolving the ones we can on our end.
The post in question had some poorly formatted HTML (various <strike> tags and <s> tags mid post). It most likely happened by accident with a button press or key command. The mobile theme of this forum software didn't appear to like this... it was skipping over one of the closing tags. I could see exactly what everyone else was reporting. I edited the tags out and it appeared to resolve the issue for that thread. Seems to be to be more of an issue with the mobile theme than a specific browser (Windows 8, Android browser, etc.).