What Happened?!

I bought this product in a mini set with better than sex (too faced) mascara and fell in love. It looked great, went on smooth and lasted forever. After if was gone, I bought a full size stick. Mistake. I\’ve had it for maybe two months and each time I use it, it skips, the formula won\’t come out and I have to go over and over it to get a full thick black line. I used to love this and I\’m confused as to what happened between the sample size and the full size. It doesn\’t even seem like the same eyeliner. I still use it and get compliments but it\’s a hassle. Thinking of switching to a new brand.