Weird Bimmerlink Issue?

[F36 435i M]

Hi guys,

Today I got a notification out of the blue on the official BMW app saying 'the starter battery health is limited'. Essentially saying to get the battery replaced at some point.

So I bought bimmerlink for the first time, hooked it up to the car to check the battery health and its at 74%, but strangely it says the 'mileage last battery replacement' was 100km ago, this works out to only 60 miles ago which isn't the case. I bought the car used about 2 months ago and have done over 1k miles.

Can anyone help at all? I will get the battery checked at BMW for peace of mind, but confused about bimmerlink?