oneall API showing as referral in GA

The oneall.com API is showing as a referral in Google Analytics (acquisition => source/medium).
The problem with this is that:

A/ I have no clue where the real referral was from
B/ conversions get attributed to oneall

Does anyone have any idea how to fix this?
Been thinking about crossdomain tracking but if there is an easier way to work around it then I would be very happy.

Thanks in advance!

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