T-Bones Fresh Food Markets

I bought sugarcane juice and I realised they have up to 50% water in it. I have drunk sugarcane thousands time in my life but I can clearly judge from its consistency and I feel bad for doing this corruption for owner.

I have purchased 6 tubs of Tamar Valley yogurt 170mg which they advertise for 49c each, therefore, the total should be $2.94 as it been written on the docket, but it added another $1.06 onto it, Why?
Went back to the cashier scan the Tamar Valley yogurt x6 again and still comes up with $2.94 @ 49c + $1.06.
So, do they have a computer error or ?
I do realise these yogurts are out of date by 3 days and I've accepted that and I have taken that chance that the yogurt would be alright, but turn around and charged me an extra $1.06 is not on!
I do not usually check my docket but I will from now on at this store!