Your apartment complex is likely using multiple APs with the same settings (e.g. SSID, key). The only thing differing between them is the operating channel. Your software is "seeing" both APs, and is showing the weaker one's channel info for a short period. This is probably not what's causing your problem though.

Most times I find that when a computer cannot connect to a network while others can, it's a wifi adapter driver issue, but it might be a wifi security compatibility problem. Please post all details of your computer, including the wifi adapter model if you need further help.