You wouldn't have had to post
from the mobile theme, but the mobile theme didn't display it properly from what I could see. I think that is why people were citing Windows phones and Android devices since the forum has a bunch of mobile detection strings that will automatically default these types of devices to using the mobile theme.
Anyhow, yeah I'm not sure what exactly caused it other than something by accident. As it is, some keypress accidentally just brought my browser back a page as I was typing this reply.

The cool thing though I didn't lose my draft when returning