What do you mean by "uploading on behalf of a group" exactly? Anyone can upload to any group that isn't locked.
You're only getting in trouble if you upload chapters credited incorrectly (e.g. uploading chapters of group a to a group b). Consequently, taking chapters of another group and uploading them under your group will, at the very least, get them removed as well.
That being said, you shouldn't blindly trust other folks asking you to upload chapters in their stead if you don't know what you're doing, because they might be from a banned group, officials, stolen from another group, etc...
As for whether your upload was problematic, only a mod can tell you. I'd wait for a few days from when you submitted the chapters, and if neither chapter shows up by then, they got removed (and you possibly sanctioned). You can ask about it in the Discord's support channel then...