Glad to hear you've found a solution by moving the potty pad!
My Casie is also potty pad trained (she's turning 3 years in October). She was a tough one to potty train... I had to limit her to one room when I'm away at work. I had to remove all mats from my condo (because she thought those were all her potty pads too). And, I tell her how amazing and how smart she is every time she poops and pees outside.
While visiting my mom's house, I make sure to keep a stash of potty pads there too. I used to put one pad in the corner and she knew to go there. But randomly, she picked a spot on the other side of the large kitchen to pee on (it was apparently she was marking, not 'needing' to go). Each time we went to my mom's, she would pee in both spots, one after another. So we had to succumb to Lady Princess Casie's needs and put two potty pads in each spot so she could leave 2 small pees in each spot. hahaha...