Refrigerator. I changed the gasket around my refrigerator door but now I can't seem to be able to

Question

I changed the gasket around my refrigerator door but now I can't seem to be able to keep it shut on it's own. It is a Whirlpool probably from around 1993 I think. It was here when we bought the house 7 years ago. The strip on the bottom was all rotten so I got the part number and got one that is suppose to be the same type. It is different and there is magnetic in the thing but, the magnet part doesn't seem strong enough to keep the door shut or I just can't seem to get the door leveled properly. It stays open about an inch or two. I was trying to save money by fixing it myself, but my husband is telling me to call an expert to come over to fix it. I don't want to put any more money into it. I was trying to save us from buying a new one. Any help would be greatly appreciated.