In and Out execution numbers not displaying in github render

[brandonlind]

I just noticed that current and previous (from several years ago) notebooks I have in github repos are rendering on nbviewer without displaying the full execution number (screenshot), even though this displayed correctly previously. This happens throughout the entire notebook. Everything else in the notebook (printouts, pandas datatables, figures, html displays, markdown) seems to render correctly but do not have a complete execution number.

I've tried the notebook's nbviewer address using both safari and chrome with the same result.