How to fix currency tracking issues on multi-domain stores?

[Lilyha]

HI community,
We have a problem with tracking on google/FB with NOT EUR markets. We have Shopify multistore- 14 domains under 1 store. 9 have EURO currency, 5 have other currencies.
All orders come in Shopify as EUR orders (Shopify converts them which is ok).  On FB and google in 95% tracks ok as EUR conversions, but in 5% (if they are paid with paypal), it tracks them in local currencies (like for example 10.000 HUF instead of EUR). In this case FB takes this 10.000 HUF as EUR and ROAS is not realistic. Do you know how to solve the problem?