Some Keypresses (ex. D, E, K) immediately end Input?

Some Keypresses (ex. D, E, K) immediately end Input?

I'm having an issue with using the Input function in AHK_L. What I want is
very, very simple: to store the user input into a variable. There is
nothing that needs to be matched. However I am finding that certain keys
such as D, E, & K immediately end the input segment for some reason.
Here's the Input I was using:
::pv::
Input, Profile, V L20 C, EndKey:{Enter}
MsgBox %Profile%
Return
It works just fine as long as I don't press any of the problem keys.
So, the question is, what am I doing wrong here to cause these keys to end
the input, and how can I fix this? Thanks & sorry if this is some basic
thing I am forgetting to do.