Hello Mahlon,
It is working fine for me. I was not able to reproduce it on my account. I first added one chart object and saved it. I went back to the screen and it was showing the data on the Chart. Again, I added one more chart object to the same screen and saved it and it was showing data on both the charts.
Is it just happening on one account? Do you want to give a shot on other account?
Let me know if this is still happening on your account.
-Inder