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Nmbr_value and Nmbr_Value are not the same. php is case-sensitive concerning variable/property/associative index names. consistency counts in programming. always using all lowercase identifier names won't have you trying to remember what they should be.

As Barand has asked why not show us the code that is used to run that query and from that we can probably tell you how to access it. And certainly using the PDO interface is a much better choice over mysqli.

What have to tried so far? How are you connecting to the database? Have look at phpdelusions site If you aren't already using PDO the I recommend you do.

this is generally a symptom of something being output to the browser prior to the headers. if this is the case, there would be a php error at the headers stating where the output was started at. is php's error_reporting set to E_ALL and log_errors set to ON, preferably in the php.ini on your system, so that php would log all error? if so, check the web servers error log file. what code is there before the headers? could it be outputting anything to the browser, such as upon an unexpected received value? also, for the screenshot, for the file in question, if you open the original or a successfully downloaded copy of it, it in your programming editor, does it start with exactly the same characters as in the screenshot?