This is not common, however it can of course happen from time-to-time. Your content is not likely to be rejected if you have correctly followed the guidelines in the campaign brief or the ones agreed on with your campaign manager, but please be open to feedback. More often a brand request changes in text, mentions or tags. A successfully executed campaign is of course in the best interest of all parties.
If you have any questions about this, please email us at email@example.com or chat with us via the orange bubble in the bottom right corner.