All of your handles are the same, but you have multiple titles that indicate these are separate products. You would need to update the handles if they are separate products, or remove the titles except for the first one and try again.
Topic summary
Importing product CSVs fails with “Validation failed: The variant ‘Default Title’ already exists.” The error commonly stems from rows being treated as variants (same handle plus filled option/variant columns), missing/duplicate handles, or conflicts when product titles already exist.
For products without variants and with multiple images: add one extra row per image and only populate Handle, Image Src, and Image Position. Leave Option/Variant fields empty on image rows; otherwise Shopify interprets them as variant lines.
Ensure each product has a unique Handle. If rows are separate products, handles must differ; if they are variants, use Option Name/Value and include all combinations (e.g., color + size). When duplicates occur, remove “Default Title” from all variant lines except the first line for that product.
Operational notes: inventory can’t be updated via the product CSV after “locations”; use the Inventory CSV instead. Some image sources may be blocked; verify URLs. RTL tags won’t import in admin. Consider shortening handles and adding inventory quantities.
Most recent guidance: if creating new items but titles already exist in admin, change titles or import as a replace. Discussion remains ongoing; shared files/screenshots were central to troubleshooting.