My Bluetooth module(HC-05) powers up and connects to my device, but it doesn't correspond with my application. When tested with another app built to check whether the Bluetooth module behaves properly by returning the characters sent to it, it did not return anything. Should I order a new HC-05?
It would be better to supply us with your code and a wiring diagram. A working module can connect with a phone, and be wired/coded incorrectly so as to not communicate with the Arduino.
Your post lacks sufficient information to make any determination.
What Arduino board are you using?
How is the Bluetooth module connected to the mystery Arduino? Schematic, please.
Read the forum guidelines. Post your test code in code tags. Use the IDE autoformat tool (ctrl-t or Tools, Auto Format) to indent the code for readability before posting code.