That type of malfunction is usually caused by either the bolt not going all the way back, or the mag not feeding with enough force.
1) Try another mag of proven reliability. If you are using TAPCO, ProMag or other non-military issue then switch to s a known mag like a east European steel mag or Bulgarian polymer mag in good condition. The mag could also be damaged or have a weak spring.
2) The mag may not be seated completely. Perhaps your friend is slamming it home and you are gently sliding it it in and not fully latching. Any mag, whether pistol or rifle, should be rapped good from the bottom to ensure proper seating and latching in place. then tug on it to see if you can pull it out.
3) The action may not be cycling completely due to lack of lubrication, crud (including old solidified grease), or incorrectly assembled parts. Did you disassemble it before the malfunctions started? Did you field strip and clean and lube it before using it?
4) Another reason the action may not be cycling completely is under powered ammunition. Try a box of some other brand of ammo. While Wolf is generally reliable, every manufacturer has mistakes now and then. You may have a bad batch.
Try those things and see if the problem persists.
BTW, you only see videos of the rebels with working AKs. The ones who had jams are probably some of the ones laying on the ground dead.