[gmx-users] Inconsistent shifts in g_rms

[Bob Johnson]

Hello everyone,
My system consists of an infinite carbon nanotube, water, and single stranded
DNA.
Whenever I run g_rms to calculate the rms displacement of the DNA or nanotube I
get the following error message over and over again:

There were 36 inconsistent shifts. Check your topology

It is always 36 no matter which group I pick as a reference structure. The
program still calculates a reasonable looking rmsd function. However, I still
wonder what this error message means and why I'm getting it. Any ideas?
Thanks,
Bob Johnson