Exactly the same problem here!!
Running Debian ->
/usr/bin/file: ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.6.8, stripped
And UltimateIRCd 3.0.1
Problem only exists on one of the leaf's. All other see the modes change, just not this leaf. And it also can't set the +s +m modes.