Bought the car and it has some quirks

Bought the car and it has some quirks. First beautiful car rides smooth has an over heating issue, however my problem is the car keys the fob and the security system, the security light is on and it won't allow me to start the car. The ignition turns the car on but start it without a key. I mean I can turn it with my hands key free and do it. Like I said the service security light is on. The only way to start the car is to disconnect the battery under the seat then reconnect it quick before the security light comes on to start her. The key also gets stuck