Keys behaving weirdly after reassembly

I tried to pry out all of my keys to clean the insides, but after a few keys it seemed like a ton of work so I decided to clean the ones I already had and place it back in. However, it seems like the pieces are misbehaving. Some of the keys simply just get stuck there inside after attaching, while one key switches forward and back like a light switch, and one is almost normal except it is slightly stuck on one corner. What have I done wrong, and how should I fix this?