Missing Dropping Entry: Week Ending March 4, 1978 of Top40Weekly.com

In the weekly charts at Top40Weekly.com, for the week ending March 4, 1978, an entry is missing under the THIS WEEK’S DROPS section:

56 23 FFUN –•– Con Funk Shun (Mercury) -12 (23)

References:
https://www.billboard.com/charts/hot-100/1978-03-04
https://worldradiohistory.com/Archive-All-Music/Billboard/70s/1978/Billboard%201978-03-04.pdf

For the second reference listed above, scroll down to page 72 of the PDF.