I work with electric home water heaters all the time and you may have too much teflon tape on it where it is letting it leak. As the saying goes, ' A little will help a little and a lot will screw it all up. The threads will rip up the Tefon tape if there is a lot on there and 'ball' it up. imo, remove the rod, clean everything up, rod threads and tank threads and then put only one, maybe two wraps on the rod. Reinstall.
2013 Forest River Salem Hemisphere SBT312QBUD
2001 CrewCab F-250 7.3 PowerStroke Diesel
SuperChip, BTS transmission, 6.0 Trans Cooler