I'm sorry to hear you are experiencing notification inconsistencies. To allow support to investigate this issue specific to your site, I would encourage you to create a case in your Private Support group aka you MyJive Group. This will allow you to include specific examples and users that are impacted. If you do not have access to your Private Support group, your Account Manager will be able to invite you to the group or they will be able to create the case on your behalf.
Hope this helps.