Within the last year and a bit, I've started having clients ask me to revise work they've made changes to after delivery. The first time it was a really small order, so I didn't think anything of it. The second time it was a large order, with a number of changes, and it occurred to me that I was basically doing new work for free. I had to recheck the entire file, which took almost as much time as the original order had, and the client could essentially have me check multiple drafts for the price of one.
Since then, I've been telling clients that my free revisions only apply to the work I did, not to things they've changed after my delivery--i.e., if they want to make their own changes and then have me proofread them, it has to be as a new paid order--but the issue has come up more and more recently, and several clients have been really unhappy about it. And honestly, sometimes they've only changed one line and it seems unfair to charge again for that.
Fiverr's documentation says that "Revisions give buyers the option to reject a seller's delivery, and provide sellers with more time to include buyer feedback and any changes required—based on the delivered work." I read this as supporting my viewpoint (that requested revisions should be based on my work, not changes clients have made since the delivery), but I'm sure it could be understood differently, so it's not much help.
TLDR: How do other proofreaders/copyeditors provide revisions? Is it abnormal for me to refuse revising content that's been changed by the client? If I do accept those revisions, is it unreasonable for me to ask clients to highlight or mark the changes they've made, so I don't have to recheck the entire file? I realize that I need to state my policy clearly on my gig page, but I need to figure out how to address the issue first. I've done a basic look at other proofreaders' gigs but haven't seen mention of it so far.
Feel free to ask questions, and thanks for any help in advance!
