Hi Jun,
They have a different number of volumes for some reason, possibly because of contrasts. It is hard to say without seeing the commands.
However, it would be safer not to use selectors like just '10', but rather descriptive labels. And do not use index 9 without being positive what is there. It could be a t- or F-stat, for example. What is the output of this for each condition?
3dinfo -verb stats.subject1.Condition1+tlrc | grep Coef
You can run that without a grep to see all of the details.
- rick