Wrong hot end?

I have having a bad time with my hot end jamming. It is not a leveling problem. I have removed the bed and and ran a print. It still jams. What is happening is the filament is coiling up in the hot end. I did not think much about it at the time. But my hot end looks different from the assembly instructions. The opening is larger and the fitting screws right into it.

Even though the printer came with 1.75mm filament. I was wondering if I should be using 3mm?

Could you post a photo?

What kind of Printer? What kind of Hotend? Boyden or Direct Drive Extruder? What kind of Filament? What is your temperature setting?