Looks like your holdopen is stuck. It is an L-shaped piece of metal that lies in a recess in the frame. It is kept in place by a small leaf spring. The magazine button pushes it upwards after the last shot, so that the breech block catches behind it and remains open.
You may want to remove the right grip, so you can 'feel around' in that area. If you do a forum search on 'hold open', you will know where to look.
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