Yup, I got this yesterday. The first three replies were off. I checked it out and realised it was clever canned replies. Upon further investigation some had down voted posts. Like you say, some had broken English. They had the usual crap of follow for follow and like for like.... Like that works on Steemit. One reply even had broken HTML markdown.

I get into the habit of muting.

Gab is probably the only social media platform I know that purges all bot accounts.