Why are captions on TV shows sometimes different from the words the actors say, but in ways that aren’t explainable by being misheard by a transcriber?

Question

For example, the actor in the movie just said “I’ve been saying that”, and the caption said “I’ve said that”. Do the transcribers have access to the screenplay, and use that as a starting point?

In: Other

Answer 1

Sometimes it’s shortened if the line is said quickly which wouldn’t be able to be read in time, sometimes they just get it wrong, and I assume sometimes they have access to the script and go off that and sometimes the actor said the line slightly wrong and it wasn’t caught. Nowadays likely auto-captions are used in some instances as a starting point.