Help with gap in chart

Hello.
I can fix my chart to look what like my proffesor want.
I add .jpg to see what I have (chart on UP) and what I need to had (this chart on down, with big "GAP").

I cant do the relationship between "Siła wyciskania" Y-axis and "Pozycja stempla" X-axis. When I change range of X-axis there only change numbers on X-axis, not the chart. To better discribe look at the picture which I add.
Please help me to fix this chart to look like on .jpg, line of chart can start on Y-axis, but later after the gap.