I suspect that some of your input files are incorrectly labeled as being in standard space (+tlrc) in the NIFTI header. You can check this using
3dinfo.
I find it useful to explicitly define the blocks using a -blocks or -do_blocks command in afni_proc.py. Also if you want all of your data to end up in standard space, you likely want a -volreg_tlrc_warp in your command.
We usually suggest you start with one of the examples (like 6) for processing needs, these often have "best practices" built in. It's worth noting that bandpass filtering isn't usually used on task data.
-Peter
