Gitlab bug?

Look here: https://gitlab.haskell.org/ghc/ghc/merge_requests/444/diffs#350c4076427c611b... Look at the comment "Is this zipping necessary? We haven't zonked the scoped_kvs or the tc_tvs, I think" from Richard Eisenberg, just below line 1925 in TcHsType. Now click on the grey "..." above his comment, to expand more code lines above. Uh oh! * The same comment now occurs twice, just below line 1904, and again just below 1925. * The first time it's on the wrong line of code * But in the second position (the correct one) the "Reply" box is inactive. I can't type into it. Is this is a bug? How to report it? Simon