Hi. You need to enable the Armory Render Path - Shadows - Shadow Map Atlasing setting in order to have multiple lamps of the same type e.g. two Point lamps.
This is due to how Deferred and Forward rendering is structured. It is not a bug. BGE/UPBGE has the same limitation because they use Forward rendering, but unlike them, Armory is able to support same type lamps via Deferred rendering.