How to get rid of the line on the right in gnuplot?

Question

using gnuplot for the 1st time. Why is there this vertical line on the right (see picture)? Or the other way around: how do i get rid of it?

Edit: It seems to occur when not using autoscale. But since I don't want to use autoscale the problem remains the same for me.

Edit 2nd: My code

gnuplot> set yrange [0:4]
gnuplot> set xrange [0:51]
gnuplot> set title "Laufzeiten Main in der Praxis (1. Importer)" font "Times-New-Roman,12"
gnuplot> set ylabel "Dauer in Minuten" font "Times-New-Roman,12"
gnuplot> set xlabel "Durchlauf" font "Times-New-Roman,12"
gnuplot> replot
gnuplot> set pointsize 2
gnuplot> replot

I'm using a mac with terminal.

Answer 1

Turns out: simply closing gnuplot and doing it again solved my problem. So sorry for bothering.