Can someone explain Sam Walker's chartrun of Bigger in 2021? Was the second entry that appeared on 25th of January a remix or should it be another song?

This is an error in the archive where the chart runs of it and Drax Project's "Firefly" got confused (no idea how). The correct chart runs are:

Date	Bigger	Firefly
21/09/2020	33
28/09/2020	30
05/10/2020	35
12/10/2020	29
19/10/2020	26
26/10/2020	27
02/11/2020	29
09/11/2020	30
16/11/2020	27
23/11/2020	27	39
30/11/2020	27
07/12/2020	25	39
14/12/2020	34
21/12/2020	39
28/12/2020	40
04/01/2021	25	37
11/01/2021	32	34
18/01/2021	33	34
25/01/2021	35	30
01/02/2021	38	30
08/02/2021	36	28
15/02/2021	31	27
22/02/2021	32	27
01/03/2021	27	29
08/03/2021	29	32
15/03/2021	35	40
22/03/2021	34	37
29/03/2021	36
05/04/2021	36
12/04/2021	38

But all the "Firefly" positions from 25/01/2021 onwards are registered as duplicates of "Bigger".

There are quite a few errors on this site,