I read over on the anime subreddit that sometimes a dubbing stufio would get the anime but with no script so they had to create it and sometimes the company would just tell the studio to do what you like with the script which was the case with ghost in the shell since it was terrible.
A lot of the older hentai's had really really bad dubs. It's hilarious. It's like they found random people from the street to do this or they're doing this on purpose lol Though I think Ghost Stories (not a hentai) has the most hilarious English dub I've seen.