I've had it happen to me a few times - just switch to landscape mode and pull the search down again and it should sort itself out
Yes, lots of times. They'll work it out, I'm sure.
It's a bug. I have been seeing it since at least iOS 10. I can't remember if it was also present on 9 but I don't think so. Hopefully it will get squashed one day.
I have a mini 2.