On two pages of my website I have a view table with some data, including prices
http://hadjinformatie.nl/umrah-prijslijst/
http://hadjinformatie.nl/hadj-prijslijst/
On both pages sorting the price column does not sort them correctly (low to high – or – high to low)
It seems to sort it randomly, in no particular order.
How can I fix it so that you CAN sort the prices from LOW to HIGH or the other way around?