Verified answer

If you had the standard square mask in the camera, but had the film counter window arrow pointing at the 16, then the negatives will overlap as you described.

For the square mask, the film counter window arrow should be pointing at the 12.

I have a few videos you might find helpful:

Loading the Holga camera:

http://bit.ly/kHolga120Load

Shooting with Holga:

http://bit.ly/kShootHolga

For more info on lo-fi photography, please visit my website:

http://dianacamera.com/

For more how to videos for Holga and other lo-fi cameras, check out my youtube channel:

http://www.youtube.com/kaituba

Maybe they changed the design, but on mine there is a little red window on the back of the camera that shows you the frame numbers that are printed on the film backing. You just advance until the next number shows up in the window.

edit- if that won't work/you don't have that little window, I think you're supposed to turn it like 30-32 clicks for 6x6 and 35 if you're shooting 6x9?

not sure with what film you are shooting with.

if it is a 120 one you just have to look through the red window at the back of the camera.

when you wind up the film you will see numbers appearing, they mark your frame.

hope this helps

Maybe it has something to do with the fact that it's really just a toy camera after all.