One of the papers (Letter to the Editor) I am first authors got accepted with no revision, and it is in under the proofing system now. The publisher gave us 48 hours to revise but somehow the third author just bounced up in the last hour to change and paraphrase almost every single sentence and add a reference without previously letting both the corresponding author and me know. When I found out, I was just OK with it, but I required her to contact the editor for approval before submitting the paper or made any change. Now the second author of the paper just rushed and submitted the revised version without anyone else's agreement although I had kept telling him not to do so.
I particularly concern that this is very unacceptable behaviour and moreover I have other two first-authored papers under the review in the same journal. Will this have any impact on my other papers? Did anyone experience the same thing before? Is making 30+ changes considered extensive changes?