Also, if you look at the image instead of saying it made the call “x hours ago” it says it is going to make a call “in 18 hours”. Instead of showing a call in the past it is displaying a call to be made in the future. This behavior only started happening in the last couple of months. Maybe after the firmware update. By the way, i also have a 2.3 (AC) running 2.1.9 firmware.
If there was feature logging weather calls and NTP calls it could be perhaps further narrowed down to what is causing this.