Why the style file mdpi.bst is not working properly in word (using bibtex4word plugin)?

I’m using the plugin bibtex4word in Word2013 to insert citations & bibliographies. When I try styles plain, IEEEtran etc., they look exactly as they’re described. But when I try a new style file: mdpi.bst downloaded from here, the labels look strange in Word:

The label style should be numeric like “[N]” as described and it works fine with LaTeX:

I’ve searched and read some posts, still with no clues what to do:

1. What should I change in a bst file in order to have numbered entries in the bibliography?
2. amsalpha-like bibtex style with manual labels

Question is: What’s wrong with the bibtex4word plugin or Word or the mdpi.bst style file? How can I fix that?

PS1:

The bbl file auto generated by bibtex4word seems to be ok:

begin{thebibliography}{-------}
providecommand{natexlab}[1]{#1}

bibitem[Feng em{et~al.}(2014)Feng, Taguchi, and Kamat]{feng_fast_2014}
Feng, C.; Taguchi, Y.; Kamat, V.R.
newblock Fast plane extraction in organized point clouds using agglomerative
  hierarchical clustering.
newblock  2014 {IEEE} {International} {Conference} on {Robotics} and
  {Automation} ({ICRA}),  2014, pp. 6218--6225.

end{thebibliography}