I recently tried using an online Excel to VCF converter to transfer my contacts, but after conversion, I noticed that some data was missing or incorrectly formatted—like phone numbers, names, and email fields getting mixed up. I am not sure what went wrong since my Excel file seemed fine before uploading. Can anyone explain why online Excel to VCF converters sometimes corrupt data during conversion? Are there specific formatting rules or limitations I should be aware of, or is it an issue with certain tools? Also, how can I prevent this from happening in the future?