so i've noticed in the bottom left corner of some of my prints something that looks like a stick. now it probably wouldnt be that big of a problem if i were taking these in a forest or someplace similar, but its on a good majority of my prints where there arent even trees...not all of my prints, but it randomly appears. what is causing this? i've taken off my lens and looked to see if there are any cracks but i couldnt see any. i've dusted it off for lint, but there always seems to be some. maybe something wrong with the film? i'm rolling my own film.