Can anyone clear this up for me?

So, basically, I noticed that on my lock screen, the word "Home" is written as "Home" but on my mum's phone, it's written as "home". I was thinking maybe it was a knock-off but the serial number matched. It connects to iTunes, has Siri and everything. Same with my iPhone.
Can anyone clear this up for me please?

Different version of iOS.

Why on earth are you worried about something so trivial?

And what actually is the problem here? It's a different version of the firmware, that's it.

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