When filtering a category with a widget, the color doesn't changes to blue.
No blue

Blue
can't reproduce, do you have the .carto?

McDondalds (on 2017-06-28 at 15.58.41).carto.zip
There you go
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investigating further, this is happening for those widgets, not for newly created widgets
spotted, for some reason at the moment of exporting the map, or reloading, the styles.widget_style.definition.color.fixed is set with the #9DE0AD color (it should be undefined)
already working on preventing this
For the record: widgets with no custom color or with no autostyle applied should always look green with unfiltered, blue when filtered. For custom color / autostyle the same color is applied.
*unless the user has specifically set the green color on purpose (even if the same color as default) which would look green when filtered, too
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*unless the user has specifically set the green color on purpose (even if the same color as default) which would look green when filtered, too