Same user multiple times - Sharing & Permissions
Sounds like there are multiple entries with your user account in the access control list of the share.  

Unless you're experiencing performance/functionality issues, I recommend contacting the person who administers that share, letting them know about what you found, then ignore it. :)

If you're experiencing performance/functionality issues, find out if anyone else who uses the share experiences the same symptoms, compile your findings, then submit them to the share administrator.