Ive had that happen on an older rifle after it had been out in the rain a couple of days.
I think the trigger or firing pin had got hung up and was released when I moved the bolt a little.
In the meantime, take off the stock, clean trigger assembly and bolt with a light oil like CRC 5.56 and blow out with compressed air. Needs to go to a gunsmith soon. People here will suggest one who is good with Carl Gustav.
Always point a firearm in a safe direction.
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