Why is the price on the shelves for drinks often different from what I actually pay in supermarkets in Germany?

I have used supermarkets in Germany (REWE, etc). But I found that whenever I purchase a bottled drink the price described on the selves was different from what I actually paid.

For example in one case, one bottled juice was shown 0.95 on the shelf, but the actual price I paid was 1.10.

At first I thought it is just my misunderstanding, but it sounds the same thing happend in most cases (or maybe always).

I also wondered it is due to VAT and the price at the shelf doesn't include it. But 0.95 * 1.19 = 1.13, not 1.10.

So what is happening here? Is this something like a credit card charge or an entrance charge?

For your information I always used Amex or VISA to make a payment, and buy only one bottled drink which costs about 0.8 to 1.6 on the shelf price.