Normal and nothing to be concerned about if set up with 'stock' settings.
Ryzen boosts aggressively and can raise voltage up to as high as 1.5V when it does so. It only does it within established temperature and power constraints. As the processing load gets heavier and temperature increases it will lower both clock and voltage. It monitors hundreds of different sensors all over the CPU to keep it safe.
Even though it might utilize a core a lot, gaming isn't really a heavy processing load.