That’s the nature of using a hook and filter system. Anyone can override what you’ve done. The best suggestion is to contact the other developer and see if he can alter his code so that it does not run when it doesn’t need to, for example, when the post type is acf-group or acf-field. At any rate, an export plugins shouldn’t be altering anything that’s being saved, somehow that doesn’t sound like what and exporter should be doing, but I don’t know much about the plugin.
