Meta (Facebook & Instagram) have recently made changes to the API and data provided to platforms. This change was made without any notification or documentation. 

We've noticed that the data we use for conversions has changed, which may impact your conversion accuracy. Please note it is not an obvious fix but our Engineering team is currently working to resolve this together with Facebook.  Although all other performance data is correct, until this issue is resolved, there may be discrepancies in ROAS reporting for Meta Platforms. 

We will immediately advise as soon as this is resolved!