shakkashuu
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I removed all mods, and in reality, I only had NHF and a few other mods for the regular version. Regardless, it turned out that the issue was with NHF, because when it's removed, the banks revert to the ones I changed in the DATE/Defaultstats of the original game. Deleting the defaultstats file in the NHF mod also didn't help. Therefore, I conclude that the banks are actually being modified by some script in Durman's mod. I didn't find anything in the NHF_mass_treasury scripts, so I'll contact Durman directly.