In years gone by, electronic components that stored an electric charge, capacitors, were made from layers of waxed paper and metal foil. In your hives the wooden frames and beeswax take the place of the waxed paper and the bees crawling between them take the place of the metal sheets. This structure will store an electric charge.
An important part of the honey making by bees is drying the honey. Removing water improves the long term storage of the honey and changes its flavour. I think you will find that the build up of electric charge across your hives is preventing the evaporation of water from the honey storage cells. This results in a higher volume of honey and a different flavour.
As the bees crawl below the frames, which will have alternate charges on them, the bees pick up the different charges on the hairs on their bodies. The end result is a bee that has some possitively charged hairs and some negatively charged hairs but overall a neutral charge.
In flight the charges will gradually dissipate from the tips of the hairs. However, if the bee collides with an object such as a wall shortly after takeoff, the tips of the hairs will hit each other resulting in a rapid discharge. This rapid discharge will produce enough energy to at least fry the bee's hairs an possibly the entire bee.