If I understand the first post, you show an actual flow of 12L per minute, flowing out of the pump at the pump end. That is, the water is going somewhere. If the ground is not getting wet, well, yes it is, but as suggested, many only straight down instead of spreading around.

Test the actual delivery. Lift a section of the pipe over a shallow container, for instance a cookie sheet, and compare how long it takes to fill it up both near the pump and at the far end. This will tell you two things: that water is flowing at both ends, and how different the flow amount is.

The tubing is about 1/2" in diameter. 75 meters of tubing length is likely to offer quite a bit of resistance to water flow.

This layout sounds like it would behave like a lighting wiring setup where there's a light every few feet, but since that tube is so small in ID, the wiring example would have to have resistance between the lights... so less pressure to deliver water.