A TiVo considers any show with an original air date within the last 28 days to be "new" unless it has already appeared in your Now Playing list. On a new unit that will include lots of reruns but it will settle down soon.
If any of the reruns it's recording have an OAD older than 28 days it may be picking them up as Suggestions. The icon in the Now Playing list will be different in that case.
If any of the reruns it's recording have an OAD older than 28 days it may be picking them up as Suggestions. The icon in the Now Playing list will be different in that case.