After iOS 11 update yesterday, even though I have SwiftKey set as the top keyboard, with Swiftmoji then the iPhone keyboard at the bottom, it's started opening the iPhone keyboard each time i open any app to type in. It does switch OK to SwiftKey and I can use it as normal then.
Soon after the update it wouldn't keep on SwiftKey at all, just immediately switched to the iPhone keyboard, but that seems better now.
Any ideas?