autoresponder -Every week the second message is sent

[Szasika]

Hello, I don"t know why, but always the same mail is sent - I have sequences 0 7 14 21...the first and second mails goes out right, but on a week later instead of the mail with sequence 14, the mail with sequence 7 is sent again...I"ve tried manually change sequence in database to 14, but a week later instead of the mail with sequence 21, the the mail with sequence 7 is sent again...Is there any possibility to repair this issue?
Thank you.
Sandra