When column formats vary across rows, converters struggle to interpret the data consistently. One row may store a phone number as text, another as numeric, and another with symbols. Excel allows this flexibility, but contact formats don’t. During conversion, inconsistent columns can lead to misaligned fields or skipped values. This is why standardization matters before exporting. An Excel to VCF Converter relies on predictable patterns to assign correct vCard fields. Solutions like Softaken Excel to VCF Converter allow users to review and map columns explicitly, reducing ambiguity and ensuring each contact is structured correctly in the resulting vCard file.