Potential Error in Number of Device from Advan Data at the Start of 2023

We are researching human mobility and have calculated the visitor rate for each CBG in Erie County using the formula: Visitor Rate = Visitors / Number of Devices.

We observed that visitor rate curves became disrupted starting in 2023. Upon further investigation, we found that the visitor count trends remained stable, but the number of devices changed significantly from 2023 onward. This suggests a potential issue with the device count data. Could you verify and address this possible error?