My mom bought a Hoover Mach 3 Bag less vacuum and the push handle won't go all the way down anymore any help?

I started vacuuming and something got stuck. The handle use to go higher. This is the vacuum I have a href="http://www.hoovervacuum.net/hoovermach3cyclonicvacuumu5180910.htm" rel="nofollow"http://www.hoovervacuum.net/hoovermach3c…/a