My stool is haunted....? Hi I think my bench is haunted because it does very strange...

Hi I think my bench is haunted because it does very strange things, and it wont work properly.

I bought this bench, one of the ones that u have to push a lever up on the underneath of the form and it will adjust up or down, but now when I sit on it, it newly goes down, afterwards back up after I get hold of off.

The lever isn't stuck, and it's a brand clean chair, smaller amount than a week old, anything I can do to fix it? I don't really want to give somebody a lift it back as it wasn't adjectives that expensive, and it's been constructed in a minute as apposed to being a flatpack when I bought it.
Answers:    turn it upside down, and check it out. perchance the gears are stuck.
find the box or the directions and call the company.