This is often normal, not a fault. In Manual mode, the meter only shows a limited range. If your chosen shutter speed, aperture, and ISO are far from what the camera thinks is correct, the indicator can peg at one side and appear “stuck.” It won’t move again until you get closer to a reasonable exposure.

A quick test: note the shutter speed, aperture, and ISO the camera picks in P mode, then switch to M mode and dial in those same values. The meter should return near zero and start responding normally.

Also, in modes like P/A/S the manual exposure scale may not always be shown unless the camera runs out of adjustment range.

If the behavior still seems wrong, try a full reset again: turn the camera off, use the two green-dot reset buttons, and reset custom settings in the menu. But based on your description, the most likely cause is simply that the exposure is beyond the meter’s display range, especially with spot metering.