How does the reporting part of Invision actually work?
Because, when I put "Last Week" a number of subscribers appears on my forum, if I put exactly the same days of last week in custom mode, the numbers are totally different. 😫

Does the Last week Filter select from the previous Sunday to Saturday? What is the correct filtering?

Please could you provide more information by letting us know the exact report you are looking at? We can then take a look at this.