I just noticed that for some reason my router is showing 5 similar MAC Address related to a local "website" named SoundTouch Access Point Setup. This website asks for a SSID and password. When I verify the MAC Addresses mentioned in SoundTouch App, it only shows 2 and they are completely different (which are not displayed in my router).
My SoundTouch 20 speakers works fine and is connected by WiFi correctly. But I want to understand why it displays that way in my home network.