Hello Tilak,
How are you !
The reason is that the bootloader image size on debug build with KDS is over 0xA000. Here is example for FRDM-K64 debug build, this is the map file:

But with release build, the map file:

So there is two method, one is please download the release version , then it can work well , i have test this.
The other one is change the "Target Address" , also need change the Application project address to the same ,
this one is complex than the first one , so i recommend you use the first method .
Hope it helps
Have a great day,
Alice
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