another carb question

well just before we parked his car this year, he took the car for a drive to the parts house and on the way he called me and told me it was running like crap. he got down to the parts house, shut it off and when he came back out it wouldn't start. I went down and pulled the air cleaner off and when I looked down inside the carb, there was a lot of gas puddled on top of the bottom butterflies. I stuck a rag down in and soaked up the gas and tried it. it started and we brought it back home. hasn't done it since and don't know why it did it then. I have bought a rebuild kit to put in it. so that has me worried. what would cause a lot of gas down on the lower butterflies of the carb.

Either something interfering with the needle and seat, or an improper float setting.

Or an overzealous teenager ?