This problem happens when your Excel file has the same contacts saved more than one time, so duplicate VCF files get created. And sometimes your data is not clean or properly arranged, so small changes in name or number make them look different. But if email or phone fields are missing, then the system cannot identify contacts properly, so duplicates appear. Also, wrong field mapping repeats the same data again and again in VCF files. And bulk conversion without checking data also increases duplicate contacts. Because of these reasons, your final result becomes messy and confusing. So to fix this, you should use SameTools Excel to VCF Converter because it manages your data in a proper way. And with the Excel to VCF converter, you get clean output. Converting XLS contacts to vCard helps you create accurate and duplicate-free contacts easily.