When EuroLatin (SIL) is chosen, some diacritics of some letters on the top row (e i o u) can’t be displayed, as shown in the screenshot. My system is iOS 13.2. iPadOS does not have this problem because the diacritics all fit within one row.
Welcome to the forum, and thanks for reporting this issue.
Can you also tell us what version of Keyman you’re using and what kind of iPhone?
Our software team will be tracking this as issue 2299
The newest version from App Store, and iPhone X.