SuperMagic fornecido o resposta correta em um comentário :
I've never seen this behavior, but there does appear to be a predictive spelling package ibus-typing-booster installed perhaps by default. My installation had no config for this, so it does nothing. Try removing it (there appear to be no dependent packages) and see if that fixes it. This is certainly a stab in the dark, though. fedoraproject.org/wiki/Features/Typing-Booster
Então eu fiz um yum remove ibus-typing-booster
e matei o processo de ibus-typing-booster. Voila!