Dependency Parser - "go" + "-ing" errors

[sefinch]

Sentence: i went hiking
[[1, 'nsbj'], [-1, 'root'], [1, 'comp']]

Sentence: i went swimming
[[1, 'nsbj'], [-1, 'root'], [1, 'comp']]

Sentence: i went riding
[[1, 'nsbj'], [-1, 'root'], [1, 'comp']]

Sentence: i went horseback riding
[[1, 'nsbj'], [-1, 'root'], [3, 'com'], [1, 'obj']]

Sentence: i went shopping*
[[1, 'nsbj'], [-1, 'root'], [1, 'advcl']]
*this one is fixed if truecasing is applied (I went shopping)

First 3 examples are correct. All above examples should identify the "-ing" verb as "comp" of "went".