Staff labels for identical solo instruments, group between staves

When in Engrave mode > Staff labels > Staff labels for identical adjacent solo instruments, I chose Group between staves. The result for the clarinets are attached as a picture. I’ve checked several times that the three clarinets have identical instrument names, full and abbreviated. What am I missing?
Kl. B + Kl. B 2

I reset the names and it is solved. I’ll make sure to make future changes to the instruments super duper identical.