Charger won t go into Samsung Galaxy S4?

Last night my charger went into my phone fine and it charged perfectly over night. Now the end of the charger won t go into the phone. Yes, I m positive I m putting it in the right way and no, my phone case is not in the way. I don t see anything inside the port when I look in and I didn t drop it or anything between last night and now. I have multiple chargers (three) and only one is not working but it s the one I use overnight and it s the best length. Another one that I use is for a Kindle but it fits and charges fine. Somehow the metal part that goes into the phone got slightly bent (I don t know how or when) but it still goes in and charges fine and I ve been using it that way for quite a while now. So what is the reasoning for one charger not working while two others do? Is my port in my phone suddenly bent or something? The charger itself works on a family members phone and they have the exact same phone I do.

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