Max number of Apple Push Notification service SSL (Sandbox & Production) for 1 App ID

Hi. I have created 3 push certificates (Apple Push Notification service SSL (Sandbox & Production)
) with my AppID, and I noticed I can't create Apple Push Notification service SSL (Sandbox & Production) certificate with my AppID anymore.
I do not see my AppID in the selection of AppID for Apple push notification service SSL (Sandbox & Production ) certificate.
Is max number of push certificate for same AppID is 3 ?