just went to browse my shared videos folder via my xbox and found i was browsing my linux mint home directory instead.
i assumed this was my mistake so i checked my shared folder settings, deleted the one that was sharing my home directory then added a new share, selected the path of my videos folder, which is on a separate internal HDD formatted as FAT32 and labelled as media, so i was navigating to /media/videos.
after pressing share it went back to the shared folders menu and instead of sharing my videos folder it had again shared my home directory, which isn't even on the same physical drive as the folder i wanted to share.
i repeated this a couple of times to make sure it wasn't something i was doing, but the same thing happened every time.
i have also shared another FAT32 partition called music, which is on the same physical drive as linux mint. this one shared fine.
i managed to fix it myself by manually editing the samba configuration file and rebooting, and my videos folder is now shared, but i thought i should share this information just in case this affects anyone else who may be sharing their entire home directory over their home network without knowing it.