Did they change the Lemoncello Wallflowers??

I've been using 2 lemoncello wallflowers in my studio apartment for a long time! I know they're strong but I love the smell & never had an issue before.

Recently I realized the refills were a really different shade of yellow (they used to be almost transparent, but now they're BRIGHT yellow)

Anyway I've been dealing with mysterious contact dermatitis for the last 2 months. Ive been really itchy and couldn't figure out why. I pulled out the plug-ins and admittedly I happen to be itching a lot less.

Does anyone know if the formula changed??

Also know some of these were a gift so wondering if they were purchased on Amazon or something & happen to be a slightly different product?