Part of the backplate of my phone is coming off?

After I got my screen replaced at Bye N Cell for my Samsung Galaxy A34, I noticed the right side of the backplate (opposite of camera lens) is slightly loose. I do push against it to put it back into place, but it always gets loose after anyways. I suspect they didn't re-assemble my phone properly, and I don't intend on paying them just to do that correctly. My phone uses Super AMOLED so it's very thin and fragile; thus, I don't wanna apply too much pressure to "fix" this minor inconvenience.
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Part of the backplate of my phone is coming off?
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