Send, SendInput, SendEvent functions entering single key multiple times - autohotkey

Question

I have created a script in AutoHotKey.I have to Enter the entire file path to be opened in the
file browser.i have used send function but it passes the same keys multiple times. I tried using the function SetKeyDelay but still it enters the keys multiple times. I tried other alternatives as sendInput and SendEvent but still it didnt work.
Even if i terminate the script in between and if the control switches to some Input box or Editor, it starts entering the values into that area. Send function keeps on entering the keys even after the script execution is terminated.
Script:
;Open Adobe Acrobat 8.
run Acrobat.exe sleep, 1000
WinWait, Adobe Acrobat Professional,
Sleep, 1000
;Open Compare Documents Window
send, {ALT}A
Sleep, 1000
send, U
WinWait, Compare Documents,
;Enter File Path
IfWinNotActive, Compare Documents,
WinActivate, Compare Documents,
WinWaitActive, Compare Documents,
Sleep, 1000
send, !H
WinWaitActive, Open,,1000
sleep, 1000
SendEvent, "D:\Sample\a.pdf"
It Enters text something like this
CCCC:::::\\DDDDiiiiii

Answer 1

Things to try:
Update AutoHotkey to the latest version.
Don't use SendEvent. It allows other input to interrupt the text as it is being entered. Use SendInput instead. It is recommended to put the following at the top of all your scripts:
#NoEnv ; Recommended for performance and compatibility with future AutoHotkey releases.
SendMode Input ; Recommended for new scripts due to its superior speed and reliability.
SetWorkingDir %A_ScriptDir% ; Ensures a consistent starting directory.
SendMode Input changes Send to use SendInput instead of SendEvent. It buffers the input and sends it all at once instead of letting other keyboard/scripts interrupt the text. See: Send for more information.
Restart your computer and make sure that there are no other AutoHotkey programs running, or that there isn't multiple instances of your Autohotkey script running. This is especially a problem when testing, as you might have launched the same script multiple times, and if the thread hasn't been properly terminated, you may have multiple instances there waiting for the Open window to be activated. Once the Open window has been activated, then you may have 4+ dormant scripts all trying to type at the same time, which would give you the output that you are describing.