branch number is odd instead of even

I am trying to convert a CVS repo to SVN.  I was surprised to get the
following warning messages:

WARNING: in '/cvs/cvsroot/os/linux/drivers/message/fusion/lsi/
mpi_cnfg.h,v':
   branch '1.1.1' already has name 'pio_v1220b1',
   cannot also have name 'kernel', ignoring the latter


It turns out that we somehow created the branch pio_v1220b1 with
branch number 1.1.0.1 (as confirmed by a cvs log), so it is
conflicting with every imported subtree in the repository (1.1.1).

How is this possible?  I thought branch numbers were always even.

Is there any way for me to fix up the CVS repo before doing the next
conversion?  I am at 9000 warnings and counting.

Thanks,
David