As with any translation software avauîlable nowadays, the result is always depending on the quality of the input. The better the input is, the better the output will be. And I have this exact same experience when using the live translations via the closed caption option. In details this means that if the spoken language is not super clear, Webex will not be able to translate properly or just translates poorly. But you basically get the same result by just turning on the closed captions. So if you have a non english speaker speak english or with a certain dialect, Webex would even get the english closed captions wrong.
But is this a issue of the closed caption or translate feature? not really i would say. The more the features are used, the better it will get as its probably also AI/ML driven. And even though the feature is currently not perfect, i still find it very helpful.
