GLOBAL X LIT ETF FUND TOTAL, page-33

I salvaged the Lit X holding data from this thread. A really interesting pattern - they appear to buy around 15% of daily volume on the dot? Is this common? Can anyone explain why?

		LIT X Holding	Accumulated	% of previous day	ASX Volume
1	24/10/2019	??			318,721
2	25/10/2019	320,097		??	394,917
3	26/10/2019
4	27/10/2019
5	28/10/2019	369,969	49,872	12.6%	1,533,487
6	29/10/2019	597,590	227,621	14.8%	1,324,092
7	30/10/2019	796,203	198,613	15.0%	767,381
8	31/10/2019	911,310	115,107	15.0%	3,081,328
9	1/11/2019	3,421,395	2,510,085	81.5%	367,916
10	2/11/2019
11	3/11/2019
12	4/11/2019	??			2,229,828
13	5/11/2019	3,940,463	??		1,453,501
14	6/11/2019	4,158,488	218,025	15.0%	3,601,370
15	7/11/2019	4,669,435	510,947	14.2%	1,044,757