My Opera Mobile should not count as desktop, it's a mobile browser

I just saw my own Android phone browser Opera 50.2 Mobile appears as desktop browser in my stats.
From the user-agent string it should be pretty clear it's a mobile device.

Mozilla/5.0 (Linux; Android 7.0; BV4000Pro; Build/NDR90M)
AppleWebKit/537.36 (KHTML, like Gecko) Chrome/71.0.3578.99 Mobile Safari/537.36 OPR/50.2.2426.136259
I'd say this is a bug, no?
I have no clue what this answer intends to say -- there is no Apple.
This is an Android smartphone. Opera Mobile is a Chromium based web browser like Chrome for Android.
I'm missing something? Why is Apple related here?
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