Yeah, I think it's wrong to have so many different currencies, but let's assume that that's a decision that CG is going to stick with.
We ABSOLUTELY have to have a way to separate potential purchases by currency, so that when we're trying to spend one currency, we don't have to scroll through everything available for completely different currencies. The UI that slaps 4 currencies under 1 tab and then mixes up when it's offering something for one currency or another is an absolute disaster of information management.
AT A BARE MINIMUM you need a section with a header identifying the currency, then all things available for that currency, then a new header identifying the next currency, then all things available for that currency, etc.
It would be much, much, much better if you could tap on a currency and limit your choices to only things available for that currency (imagine keeping the taps across the top the same, but adding tabs down the left side for currency type -- this should then also be available in other tabs that offer purchases for multiple different currencies such as Shipments and GET tabs).
But this thing is just a nightmare of trying to find what you're interested in. What a mess.