The problem of the speed mismatch between the worm gear push rod motor and the nozzle extrusion motor:

When the worm gear reducer push rod motor moves too fast, it will cause too much mud to overflow from the top of the extruder. At this time, you can adjust the following parameters in CURA:

M163 S0 P0.9; Set Mix Factor
M163 S1 P0.1; Set Mix Factor
M164 S0 ;Save Mix

At this time, the speed of the push rod motor and the speed of the extruder will become 0.9:0.1, you can also adjust to the value you need, such as: 0.5:0.5, 0.3:0.7, etc.

Here is the statement of M163: