I have having the same problem of not being able to see beyond six months of progress. It is very frustrating. I made a lot of progress a year ago and would really enjoy seeing that on a graph. I have complained several times but nothing has been done to fix it. It should not be that difficult for an IT person to fix it.
This question has come up before. I found a solution. Do a tag search for "calendar".
Think of food as fuel for the body instead of feeding emotions
Same problem for me; only able to view 6 months ... the graph would even be better if you could VIEW YEARS prior, even it's just quarterly, for those that have stuck around even though they don't update or fix problems on the webpage.