I recently built a new pc and when I plug in my headset (mic attached to it) my friends on Discord and game chats can hear my output sounds like games, music, voice chat, videos, etc. Even when I record my voice I can hear my game sounds in the background, and it's really frustrating. I'm currently using a Hyperx Cloud and the detachable mic it comes with, I'm also using the splitter it comes with since my microphone doesn't work without it. I've tested it with a different mic and the issue is still there. Could be the sound card but I don't know much about that. I've reinstalled realtek drivers but to no avail. Please help, I've tried nearly everything and it's so annoying. EDIT: I forgot to mention that even when the microphone is unplugged, it still plays output audio.
Headset: Hyperx Cloud
Mobo: Gigabyte ga-ab350-ds3h