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My usb ports outputs different voltages

I have made circuit that runs on USB. however, when i plugged into front panel of my pc or raspberry pi, it only gets around 3.3v, but when i plugged it into back of my pc, it gets 5v as intended. Shouldn’t all USB output same voltage? I have tried both USB 3.0 and 2.0, and on back of my pc, 3.0 outputs 5V and 2.0 outputs 2v. the other ports outputs same 3v whichever 3.0 or 2.0
Edit: Rebooting solved the problem 🙁

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