Tim Hortons

I did the Tim Hortons survey where you only need to pay $1 for a pack of 10 timbits. I gave it to the cashier and she charged me $1.3. I know this is the wrong price because the other times I ordered this it was $1 and my relative who was ordering right beside me also had the 10 timbits for $1 and only had to pay $1. This happened today which is June 21, 2019.