currency is not changing

hello,
I am using your pro plugin, I set up different currencies, but the issue is that sometimes it’s not working, I don’t know if that is due to cache but you should have taken into consideration the existence of a cache plugin I guess, I tried to use the option that we should enable when we use a cache plugin but it still not working, when the customer tries Jordanian dinar, for example, the new currency appears for w millisecond then it directly replaced by the default currency, plz I need a fix for this cz my client is soo upset with that