I agree with you that it seems awfully low.
A way this could happen would be.
Daily
Cume
Daily Change
Weekend
Drop
6 Day
16,900,000
278,720,146
-16.56
17,250,000
295,970,146
2.07
22,000.000
317,970,146
27.54
23,500,000
341,470,146
6.82
11,500,000
352,970,146
-51.06
57,000,000
-74.09
18,850,000
371,820,146
63.91
75,850,000
-65.52
110,000,000
Seems really low would mean that the second monday despite being 25th of December would be lower than the first. And a lot lower than Rogue One's second Monday.