I have received a number of refunds which ended up as Curve cash. I use the “pay automatically with curve cash if possible” feature which I guess is a decent response to not actually getting cash paid back to my original card.
However, the past weekend I have been seriously overcharged for my transactions. I do not have the actual transaction amounts / receipts at hand but my guess is that I have been charged in GBP instead of the conversion from SEK to GBP. In Swedish currency this translates to being overcharged at least 10 times for each purchase.
It seems like one person from Hungary has commented on this issue previously if google translate helped me correctly:
I have sent a message to support through the app about the issue but I suggest everyone who uses Curve cash to check their recent purchases.