I see three potential possibilities:
1. Something is stuck in the fourth valve slide of the instrument, or there's a leak somewhere in that tube.
2. The fourth valve plastic valve-guide is worn out and the valve has rotated out of alignment, creating a half-hole effect which will make the horn stuffy *and* drive those notes sharp. If you try to rotate the stem while the valve is seated inside the cylinder and it gives and lets you turn it, then that's definitely the issue. The valve shouldn't rotate while it's inside the horn.
3. Kids will sometimes put the wrong valves back in the wrong cylinders after oiling them. The fourth valve on my own Willson 2900 is shorter/stubbier than the other 3, meaning if I tried putting it in a different cylinder, the holes would be misaligned with the tubes. I've personally never tried swapping my fourth valve with another valve, so I don't know if it's even physically possible to do that with the size difference with that particular valve, but I've seen kids put the 2nd valve into the 1st cylinder, and the 1st valve into the 2nd cylinder on Yamaha Euphoniums before which definitely causes problems.
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