Visitor report not showing the right IP

Guys I have an install of PIWIK 2.4.0 just updated. For the last several days across all sites on that install (about 12) it is showing the visitor ip on all visits listed as the ip of the website server?

Is there ia setting I need to change as part of this update etc?

Can anyone help me with this?

maybe your piwik server is behind a proxy? see: Installation - Analytics Platform - Matomo