Have you noticed the same author of many Linkedin posts despite knowing that someone else from your team has authored those posts?
The name that appears next to "Posted by" on LinkedIn posts published through Agorapulse is only visible to the page admins and not other LinkedIn users. The name that appears is always the name of the page admin who added the page to Agorapulse. This is due to a limitation set by LinkedIn.
However, if you want a different name to appear, you can reconnect the page to Agorapulse using the credentials of a different page admin. This will change the name that appears next to "Posted by" on all future posts published through Agorapulse.