Recently, I scanned some Wi-Fi networks with wifite tool in Kali. This tool said that one of the available Wi-Fi networks is secured with WPA2. Ten minutes later, I scanned these Wi-Fi networks again. In this scan, wifite said the same network is secured with WEP. I scanned these networks again using Fern Wi-Fi cracker. In this state I saw that the network is secured by WPA. I'm confused with these observation. Now my question is:
Do security methods change over the time or are these programs are unreliable?