Problem 1: Brand/manufacturer is not mapped to Lazada brand
Solution 1: Make sure brand/manufacturer is mapped to Lazada brand, then sync again
Problem 2: Product width, height and length is empty
Solution 2: Make sure width, height and length is filled in, then sync again.
Problem 3: Product model is different between Opencart model and Lazada variation model
Solution 3: Make both model is a same