Many e-mails "LingQs of the Day"

I am wondering why I received many daily e-mails “LingQs of the Day”. For example,

8 e-mails “Chinese LingQs of the Day”
5 e-mails “English LingQs of the Day”

Is this a system bug?

This was related to an issue with the database – please see this thread: Website Very Slow - Language Forum @ LingQ

Automated emails should be working properly now, so let us know if you receive any more duplicates.

Thank you very much for responding very rapidly. Yes, if I receive any more duplicates, I will let you know.