Problem with feed prices | WordPress.org

Hi.
We have problem with Product Feed Manager for WooCommerce plugin. Our store is multicurrency and multilanguage. When we are creating feed for a Czech store where the currency is Czech crowns, the price is multiplied by the euro exchange rate, which is the default currency in the store. This is bad because prices are then dramatically inflated.

Importantly, we were able to notice that after updating the feed settings, the prices are good for about an hour/two, and then they are already displayed badly, because they are multiplied by the euro exchange rate. Why?
Is it a problem with some cache?
We can share access credentials to our admin panel and FTP.

We’ve tried hundreds of different combinations of add-on settings, disabled wprocket. Please help.
thanks

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