Haha no worries, that's not the first time it has happened. The same exact thing happened when M Dragon was hosting this season a week or two ago. His bolding randomly disappeared and I had to revive it by digging through the edit history (which isn't pretty to look at) and manually editing stuff in.
If you want a crazy story, check this: when I hosted a tour once, I had to deal with the following: 1. A momentary server crash and 2. Two people faking screenshots of them winning (this was really stressful, lol, and I was worried it'd interfere with my aim of getting a fast hosting time since a bunch of us would compete to see who could finish a tour the quickest). There was also a time the bolding thing occurred to me as well if I am remembering correctly, but I recovered it by hitting backspace, so crisis averted. So really, you probably did better than me, lol.
The craziest things really do happen in tours! There's a few more really bizarre ones that come to mind and I can tell you about them on IRC next time you're on if you're curious.