Loop of notifications on 6.1.4. after returning from iOS7

I installed iOS7 last week on my iPhone 5. I tried it several days and i decided to go back to 6.1.4. The problem is now the infinite notifications in various app (Tweetbot can notify 1FAV 122 times, Whatsapp may sound twice for a single message, Gmail marks mails without receive anything, etc..).
I called Apple and told they can not give me solutions that do not support iOS7, although it is in 6.1.4.
Interestingly, this same thing happens to a co-worker.
We have tried to restore back 6.1.4 without backup, happening the same, deleting the apps,etc.

Do you know any solution? Thank you.