Filling out a form, but it keeps writing in a straight line

I hope this makes sense, but when I fill out a form, and I have space to write/explain something, it keeps the information a straight line instead of coming down (like how it does in this box) so you can see where "it keeps the" and information is on another line? Well on the forms it keeps it in one line and so it doesn't show on the form. I keep pressing enter to make it go to another line but it wont. Does anyone know how to fix this?