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Thank you. Found that there are a few Customers account which have the same email address as the Admin accounts. Client was informed about this and decided that this message isn't really annoying and keep it as is, but if it starts to become a big issue, then they'll consider the solution to change the email addresses. 

If someone else is having the same issue, can't tell right away if it did solve the issue itself in fact, as the client decided to keep it as is for now. But if anything changes in the future, I'll try to remember and post here, so you'll know.