'Value in stack gets overwritten

I have a C++ program that reports a crash. Analyzing it further, I am able to figure out the exact place where the data on stack gets corrupted. But, I am not able to understand why that happens or what would cause such corruption. At a point in time

value at [rsp+40h] is 00000249 15ed4de0

Then the following assembly instruction gets executed
mov rsi,qword ptr [rsp+40h]

Now, the value at
[rsp+40h] is 00000000 15ed4de0

The higher order DWORD has changed from 00000249 to 00000000. There are no changes in the addresses nearby. I do not understand why a read from [rsp+40h] would end up corrupting the value present at that address.

Any pointers are welcome. Thanks in advance.

c++assembly 64-bit windbg stack-corruption

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'Value in stack gets overwritten

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