my USB keyboard keys mixed up, when i press space, num lock also get pressed. when i press ALT some random action starts

[wahab butt]

When i open key tester, i pressed space, key tester showed me space, menu and num lock. And when i pressed ALT it showed me ALT and num 4. Some other keys are also like that except Alphabets, numbers and function keys. If anyone can help then pls do something. This problem is with the USB keyboard not with the laptop's keyboard.

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