Hi there!
It's a compatibility issue, probably with Galv_MessagesStylesMZ. Someone else asked me for help with this these days, but it did end up solving by himself. Try changing the plugin order or some configuration. But it hit other issuels later.
The solution he found was changing Galv Plugin and using triacontane's bubble message plugin.
I may have time to try to look for a solution only from monday and forward.