Formatting is often compromised when you split manually due to missing headers or uneven encoding. This is the main reason why your contacts look mixed or incomplete. A split vCard tool keeps the format intact by default. It locates and handles each contact string in a proper way; thus, the data is kept safe. I have experienced the same problem and solved it with the WholeClear Split vCard Software, which unlocks contacts in a neat manner without any changes to the formatting. If you are not experienced with the structure, it is better not to manually edit VCF files.
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