If the footer is placed inside the report body (for example, in a block or a list footer), it will appear right after the last content item not at the physical bottom of the page.
Use the Right Footer for the Job
Page Footer > Always stays at the bottom of every page.
List Page / Overall Footer > Appears inside a list, it won’t sit at the bottom of the page unless you use layout tricks like full height containers.
To Keep Something Fixed at the Bottom of the Page
Use the Page Footer band
Go to Headers & Footers > Page Footer and place your content there. This is the only guaranteed way to keep it at the bottom of every PDF page.
For list totals or summary sections
Wrap your list in a block.
Set the block’s Height = 100% (Properties > Size & Overflow).
Inside that block, add another block for your footer content and align it to the bottom using vertical alignment or padding.