When attempting to unzip, the zipper just lifts up at the top stops. However, if I hold my mouth just right, and press forward on th zipper with my finger, it unzips perfectly.
It may have something to do with the upper top stop not having a one tooth gap for the last tooth on the opposite side. This may cause tension that prevents easy opening.
Try carefully removing the upper top stop with a pair of wire cutters, then replace with a new one leaving a slight gap.
I replaced the top stop leaving a small gap and changed the direction of the zipper to the correct direction and zip works perfectly.
It may have something to do with the upper top stop not having a one tooth gap for the last tooth on the opposite side. This may cause tension that prevents easy opening.
Try carefully removing the upper top stop with a pair of wire cutters, then replace with a new one leaving a slight gap.
I can't see any other issues in the image.