Kotex pads causing a bad smell

I have been using Kotex since it initially launched a few years ago and I have loved it since then until recently when I have been struggling with a bad rat smell when I am on my periods for months. I have consulted doctors and gynae until my recent visit to the clinic when a nurse suggested I change the pads. I have since changed the pads and can confirm that smell is totally gone. I don't know what has changed with Kotex however it is no longer the same I knew it to be. I am disappointed because the bad smell made me waste money with doctors and gynaecologists fees and has also stripped down my confidence as a woman. KOTEX DO BETTER!