Why do you think there are 5? The graph shows the following: 3 ratings of 5 2 of 4 1 of 3
The filtering seems to find it difficult to show all 6 at once (so many unstarred to-reads are confusing it, looks like), but if you filter by 5 stars, then by 4, and then by 3, you'll see them all.
3 ratings of 5
2 of 4
1 of 3
The filtering seems to find it difficult to show all 6 at once (so many unstarred to-reads are confusing it, looks like), but if you filter by 5 stars, then by 4, and then by 3, you'll see them all.