How can I fix sending MouseWheelUp occasionally using modifiers?

[AHKPenguin]

I'm trying to add some behavior that I have bound to shift+MouseWheelUp but occasionally the shift modifier is being applied to what I am sending, here is a simpler repro case with output:

Code: Select all

#NoEnv  ; Recommended for performance and compatibility with future AutoHotkey releases.
; #Warn  ; Enable warnings to assist with detecting common errors.
SendMode Input  ; Recommended for new scripts due to its superior speed and reliability.
SetWorkingDir %A_ScriptDir%  ; Ensures a consistent starting directory.

#InstallKeybdHook
#UseHook On
#MaxHotkeysPerInterval 200


+WheelUp::
    send {a}
return

This will output:

aaaaaaaaaaaaaaaaaAaaaaaaaaaaaaaaaaaaaaAaaaaaaaaaaaaaaAaaaaaaaaaaaaa

The script I am writing is supposed to let me use ctrl+mousewheel to mimic standard mousewheel behavior, but sometimes it will still send ctrl+mousewheel causing things to zoom in and out.

UseHook is something I found suggested for similar problems but has no impact.

Thank you