iphone 6S running iOS 15.5 - Safari identifies as ( Tablet running ios )

iphone 6S running iOS 15.5 - running Safari identifies (wrongly ) as ( tablet running ios ). 
device.mobile() is also (wrongly) false, reporting that it is "tablet", when should be "mobile".. 

Same device ( phone 6S running iOS 15.5 -)  when running Firefox, it correctly identifies as (mobile running ios)  