To clarify, the tall images have an aspect ratio of 4:7 with dimensions of 1024 × 1792. DALLE-3 can be a bit odd sometimes with its generations but it seems as though they can be fixed! If this can be solved on the user's end, perhaps OpenAI will be able to resolve the issue in due time. The prompts for the erroneous and correct images are quite similar so I am quite perplexed as to what may caused this, nor what fixed it.
Erroneous (rotated landscape)
Tall photograph of an elderly Black business man in a sharp blue suit, balancing himself on a stone in a flowing river. The sun casts a warm glow on him as he blows a dandelion, its seeds floating gracefully in the breeze, surrounded by tall reeds on the riverbanks.
Correct (portrait)
Tall photograph portrait of an elderly Black business man in a sharp blue suit, standing in the middle of a flowing river. The sun casts a warm glow on him as he blows a dandelion, its seeds floating gracefully in the breeze, surrounded by tall reeds on the riverbanks.