@JimJim can you explain further what you mean by "strange IPs" and browsing the UI ? most likely, if you see the Piwik visits in your Piwik is because you enabled the setting:
; if set to 1, a Piwik tracking code will be included in the Piwik UI footer and will track visits, pages, etc. to idsite = 1 ; this is useful for Piwik developers as an easy way to create data in their local Piwik track_visits_inside_piwik_ui = 1