Injector seals keep blowing off?

A friend has this issue that I am trying to help him with. He said a month ago started misfiring he changed coils and plugs, kept misfiring on 3 a d 4, be changed injectors he said it keeps blowing injector number 3 under load like on the highway and when idling it's like its choking from too much fuel. He said he saw something about a code which says cylinder 3 at max trim level which i have never seen before. So, it blows the seal off and leaks. He sent me this video which is attached. I worked on several BMWs never seen that with an injector.