It is not refermenting, because you haven't added anything much that is fermentable.
Bubbles are not a good indicator of fermentation activity anyway, and one every 2-3 minutes is meaningless. That is more likely to be the effect of the beer cooling off at night and heating up during the day.
If it has been sitting for a month it is as done as it will get. Taste it daily to see if the vanilla/cocoa flavor is where you want it, then package the beer.