If you're talking about Slack or Discord messages, it might be that the generated messages that you can't see are from a private group.
You can spot these groups in the left column of your Slack window showing a lock instead of a hashtag in front of them.
To make sure that private communication stays private, we keep these messages out of your activity feed. ☝🏼
If there is anything you would like to change or need help with, please contact your success manager, and in case you don't have one yet, please drop us an email at firstname.lastname@example.org