I've only seen one creation that I considered a false NSFW positive, which I already passed along.
Semi-related, It may be beneficial for the community if the 𝘢𝘤𝘵𝘪𝘰𝘯 of updating an image to NSFW is attributed to Imgflip or it's AI, rather than to the user creating the content, which may or may not actually be what Imgflip considers NSFW.