This is a funny one! I can see it when I'm NOT logged in, but as soon as I log in it vanishes!
My explanation for this would be: sometimes posts get stuck when they are created due to connection lapses in the database. This means that not all of the data required to show the post makes it into the database, only a half entry makes it in. Sometimes that means it shows as a post on the board list but when you get there, it's corrupted.
I'll try to find a solution for this but as it's a rare occurrence there might not be much that we can do. The best would be to message the post creator and let them know to re-do it.