I used to be able to compare my TBR's stats with other stats, for example the books I have read this year, and loved this option for seeing how my current TBR compares to my usual reading habits. Now I can't do this - when I am in my TBR stats and click "compare two periods", it defaults back to comparing this year's 'read' books with all time 'read' books with no option to compare my TBR books. Has this function been removed, or is it a bug?