Using Evernote with autocomplete or autocorrect causes issues. Text appears twice and becomes mangled.
Samsung Galaxy S5 Neo
Android 6 (both versions affected)
Keyboard swipe: Continuous input
/ Settings / Language and Input / Samsung Keyboard
Set following features on:
Predictive text On
Auto capitalise On
Auto spacing On
Auto punctuate On
Setting "Auto spacing On" seems mandatory to solve the issue.