It all depends...could be new information added to system. I work in LE and have seen many times the NCIS check cause a few hiccups. I have see the system delay if it’s the same name as a prohibited person but different date of birth, similar name and same date of birth...etc. The recent gun sales have also gone out of control. The sales are way up but areas where the NCIS are actually conducted are still in a COVID-19 posture with minimal staffing. Most staffing positions are contractors. They are prohibited from entering federal buildings during the pandemic. It has caused a lot of stress on an already stressed system.
I am sure it will all work out. The delays suck though...I have a delay myself during COVID-19.