Filemaker Go - 14
Device - iPhone 6Plus IOS 9.2 [I have had the occur on my iPad]
The Popover Button will sometimes be missing some or all of the fields or buttons.
Replicate - sporadic
Workaround - N/A
Note 1 - The More and Characters are also Popover and I have a similar issue .. they Contain Fields only
Note 2 -I have had no issues with this on my MacBook Pro - OS - El Capitan / Filemaker Advanced 14.04