A currency mismatch occurs if the currencies used in AdWords and your online store are different. With Cobiro you can set your own strategy by choosing the percentage of the transaction value (sales price) that you spend on advertising. Therefore, it is important to use identical currencies in AdWords and your online store. Otherwise, it is very likely that Cobiro will invest too little or too much into your advertising. If you have set two different currencies, you should contact Cobiro's Customer Success Team and we will help you to reset your account and change your currency in AdWords.