APT-COM Has given me the wrong frequency

[Darrin Towers]

This morning I was flying to KCPT and around 15 miles out I pressed the APT-COM Button to load the Frequencies into the Radio head, I pressed the ATIS button and switched over to Listen to the weather, while listening to the weather I pressed the Tower button to load it but when I switched to Tower it said CPT but didn't have the correct frequency programed in. It loaded a 118.3?? something instead of the 122.800 there was a Airplanes and Coffee event going on and a bunch of planes on ADSB so I knew right away that something was off. I pressed the tower button again and this time it loaded the correct 122.8 . The 118.3?? that loaded showed CPT on the skyview display but did not match any frequencies for KCPT or DFW ATC. If I had been going to an airport without much traffic I might not of noticed the error as quickly.