My gym has 3 20kg bars. They are cheap old and abused, all three are bent in the last year orso (with barely 200kg on them in the squat).
I notice in the deadlift that the bar first wants to get into the bent possision before pulling off the ground. Also with squats it’s more difficult to keep it from moving on your back. The gym owner is a cheap bastard so no luck there. Am I crazy or is this a disadvantage and maybe even dangerous?