Not sure why the banks do it, but it happens.
You may be tempted to throw away a numbered page on your statement if it is blank or contains an advertisement. Unfortunately, if the other pages are marked 5 of 8, 6 of 8, etc., the underwriter can’t be sure a missing page 8 of 8 had no important information.
To be sure there’s no delay in processing your loan application, please save and provide ALL numbered pages of your bank and other asset statements, even if they’re blank.
Thanks for your cooperation!