I have been relying on Samsung voice input for a few days because medical reasons make it very hard to type with my hands. I wasn't having any trouble until I updated my system yesterday around 2:45pst. Suddenly when I use this feature it starts acting weird.
It'll put something (of varying levels of "work appropriate") in the text field that doesn't even vaguely resemble what i said, either in length or content, then after a moment it will disappear and be replaced with what I actually said. Because of the aforementioned health issues it's hard to screen shot, but I succeeded a few times. I am linking an example (after censoring it).
Needless to say, this is not funny. And it started immediately after I rebooted from the system update yesterday. I don't have any idea how to fix it. I even factory reset my phone and it is still happening.
I am having the same issue, have you found a fix?