Bento Grid - Category filter is not working has expected ie "foundational, frontend etc" its filter in grid wise and also in home page

[InventRajasekar]

Repro steps:

1. Goto this Url - https://www.bento.io/grid
2. Unselect all the filters
3. Now select "fundamentals" it lists all the languages related to "fundamentals"
4. Unselect the ""fundamentals" and select the "frontend" it lists the grid in "Red" along with the "Sublime Text & Vim" of fundamentals category also listed in "frontend" category and so on,
5. Repeat the 4 steps respectively and select the next category, "Sublime Text & Vim" of fundamentals category also listed in "respective selected category"

Repro step: as video
Grid - http://screencast.com/t/QpKX3sY1n
Home page - http://screencast.com/t/fsHlbBQ2q6Aa