InMails were sent twice
If an InMail was sent twice to a contact, there can be several reasons for this.
1. You updated the start date in the InMail feature
This causes InMails to be sent to a contact again.
2. You sent InMails manually or using another tool
CompLeadly can only recognise and skip InMails it has sent itself. If you send them manually or through another tool, CompLeadly cannot recognise this and will send another one.
If the InMail also has the same text, it can look like CompLeadly sent it twice.