Oh, it might have gone into the blurb tab (if you click "Blurb" you might see the code there). I'm still not sure why it does that sometimes, but it probably happens when switching layouts / themes. did you do either of those right before this happened?
I checked the blurb tap and found it empty but I tried switching layout and clearing the tap again, just to check, and then it finally disappeared?? Very odd. No I didn’t do either or but I guess as it’s gone now I’m better not touching it again xD
Thank you!