Memory card doesn't hold in the slot

It's odd my memory card doesn't hold inside the slot if I don't close it. I don't know what happened but one day I noticed that when I plugged the charger, I saw a little bump on the case, I took phone out that's when the memory card fell on my hand and every time I'll try to insert it on the slot it wouldn't stay in, I need to close the slot device so it stays in. There's no problem with reading the card, but it's annoying because it worked fine, I applied a little pressure and it stay still, if I want the card off, I'll do the same, I hope anyone could help me, please...