I installed a wall shelf, but it falls a bit .. any help?

I installed a wall shelf, but it falls a bit .. This is an IKEA LACK shelf and I plasterwalls. I have the candles and got a few screws into the studs behind the wall, but sorta plateau sinks a little when I saw the shelf behind the metal piece that supports the plateau, is still attached to the wall, it is only the posts that hold the plate in position to bend a little. Is that bad?

If you are a weight on your shots are gonna pop. Perhaps your storage media is already bent. I would put in some extra ones just to make sure

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