@Bambang0:
When I mouse over your calendar I see $43 USD and it does not change on the weekend, just as you describe.However, when I try to book a Saturday niight by clickin on the calendar it changes to $52 USD.
With that said, there are a couple of things that may override weekend pricing. The first is Smart Pricing, Go to your calendar, click on Pricing Settings in the charcoal menu and make sure Smart Pricing is turned off.
If it is already off, then look at your calendar itself. Did you manually change prices on your calendar by clicking on dates and entering a new price? This will override the weekend pricing too.