Price Difference

Products have different pricing in just a day. There was a product i wanted to purchase last night that was R129 and then this morning it all of a sudden its R159 and the product was not on sale. I previously purchased this product at R129.

Last week Friday there was a product i wanted it was R99 and now this week its is R249.

HOW CAN THE PRICING CHANGE IN JUST A SHORT TIME???? THIS IS NOT THE ONLY 2 ITEMS I HAVE SEEN IT WITH.

I have screenshots of the items with there different prices.