i need help with the oekaki page. when i start a new drawing, and i want to use the curved line tool (the one that you can use to make curven lines

), it always makes loops! i click on the tool, make the line that i want to curve, but then i just turns into a loop into a straight line! im not sure how to explain this, but i NEED HELP!! i need that tool to do all of my drawings on the oekaki! am i the olny one with this problem?
PLEASE HELP ME!!!