The pistol's outside is nice and clean so I assume the inside is equally well cared for.
7.65 Par is usually a reliable feeder. I have only had failures like those of your pictures when using underpowered ammunition. The minimum load with my pistol is 4.5 gr of Unique and an 94 gr cast bullet. 4.2 gr produced results like yours.
I only use handloads and don't know how powerful the factory W-W cartridges are. I know Fiocchi has a reputation for underloaded 7.65 Par ammo.
How old is your ammo? I once fired some very clean looking Winchester 7.63 Mauser ammo that was post-war. It looked great, the box looked like new, and every round failed to work the bolt of my C96. That pistol wound function reliably with 1,100 fps loads.
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