Increasing proportion of "new customer" without attributed platform

Hey, my app is available only on iOS and android. I’m using unity SDK. Since a few days now, I have a increasing number of users (up to 30% some days and some of them are paying users) that are flagged “other” when looking at the new customer chart in the revenue cat dashboard when segmented by “platform”.  When looking at some these users data, they seem to be actually using an iOS or android device. This absence of attributed platform is also seen in the extracts. Not sure why this is happening more and more these days.