Thank you for your quick response!

It is probably due to preprocessing run more than once.

I had originally run everything when I only had resting imported from fmriprep. Then I imported the tasked based data and tried to run preprocessing ONLY on the task based. However, this threw errors in the process and it could not complete. So then I reran all preprocessing saying to "overwrite data you already have". This took care of the errors. But must have somehow ran preprocessing twice?

What can I do to redo preprocessing for all the data and make sure it is all only done once on the raw data? Or how might I have accidentally caused preprocessing to be run twice and how do I fix this and then avoid this in the future?

It is also possible I misstyped one of my task runs to overlap with a rest run, but I recall trying to be very careful with that. It is a little difficult because not all subjects completed resting, and not all subjects completed task, and not all subjects made it for all 4 "sessions". So this means CONN session numbers vary from like 2-16, and while session 2 for some subjects may be a resting run, for another it might be a second task run.

Is there any aspect of that to worry about with the preprocessing by chance?

Thanks!