12 seconds after you suggested this edit, Madbreaks modified his prior revision. (Edits within a small time window are collapsed into one, which is why only one Madbreaks edit appears in the post's revision history.)
Madbreaks' edit came after yours, and therefore clobbered yours. He loaded the edit the page to start editing before you suggested the edit though, which is why he didn't have a chance to approve/reject it before editing.
This is a bit of an edge case, but definitely not a very user-friendly experience, so we'll take a look at ways of improving it. Sorry for the confusion.