This is not a browser cache issue 100%. It's an issue experienced by all of us trying to automate the pushing of documents from HubDoc or ReceiptBank to QBO. It actually occurs to Xero as well, not that this gives QBO an excuse.  In Canada we have functionality within QBO that is supposed to be like a HubDoc or ReceiptBank but can't pick up the most basic of information and we would need to enter it all manually.

This 1:1 currency issue is why they turned off auto-processing of foreign currency rules in QBO. They too saw the issue and the quickest way to get around it is to cease pushing foreign currency bills into QBO.

We categorize the transaction from the Banking window - never just use the add without opening the transaction and ensuring there is a currency exchange value.  An alternate we tried was to use a tool that bulk adjusted the exchange rates in bills and payments but it was inefficient to do this every day and we need up to date reconciliation and the ability to pull P&L and BS reports at a moment's notice.