Patch Sliding??

The first few weeks I had the patch on it didn't move at all and now that I'm two months in I've been noticing in recent weeks it moves ever so slightly as you can see in the picture. Am I still protected or should I put a new patch on, I only have one more day left with this patch but it's been like this since day two? I haven't put any lotion near that area and I always make sure that the area is clean and dry before applying...