SendInput %userInput% causes my computer to malfunction oddly - autohotkey

Question

SendInput %userInput% causes my computer to do very weird stuff. Sometimes it logs off, sometimes my arrows of the keyboard get disabled, sometimes it runs cmd in windows an infinite times...
UPDATE:
this is the thing that gets inputed in the command line and runs:
runas /user:administrator cmd
UPDATE:
I think I almost got the problem, as such I edited the question to leave out what I deem to be irrelevant now.
When SendInput is happening, and the user is still inputting data in the keyboard, such as pressing the win-key, then this can cause the system to log off because win-key + l is a shortcut for that. Likewise must be for all the other things that are happening. Another observation is that SendInput skips certain characters, like {enter} etc. It only processes them at the end, when all the regular characters are put into place. I notice that at the end, SendInput is still busy doing stuff, perhaps some exotic characters it delayed till the end. Because the user think the output is complete, he ends up pressing the shortcut key again which in combination with the current sendInput is causing the system to crash.
UPDATE:
It also goes bezerk if there is a "!" to be send with SendInput.
This is one string I pasted to the copyboard:
dsjkfhjdsfsjdh!!!!!!!!!!!####################$$$$$$$$$$$%%%%%%%%%^^^^^^^^^^^^^&&&&&&&&&&&&&*****(((((((((())))))))))))____++++++++++++++++=======------------000000000000000099999988888.
But the output is WITHOUT the exclamation marks. Like this:
dsjkfhjdsfsjdh#######$$$$$$$$$$%%%%%%%%%&&&&&&&&&&&&*****(((((((((())))))))))))____+======------------000000000000000099999988888.
Why is that? Are there any other characters? Exclamation marks are important I feel, and I don't want to remove them. Are there any workarounds?
UPDATE:
It is more complicated than that. When I copy paste the above characters WITHOUT the exclamation marks, it still does weird stuff.
Here is some of the code that eventually userInput combines and sends away with SendInput:
StringReplace, contents, save_selection, ``, ````, All ; Do this replacement first to avoid interfering with the others below.
StringReplace, contents, contents, `r`n, %A_SPACE%, All ; Using `r works better than `n in MS Word, etc.
StringReplace, contents, contents, `;, ```;, All
;* loc_title origanally contains browser specification. Remove it.
StringGetPos, pos_delim, loc_title, - , R
length := StrLen(loc_title)
count := length - pos_delim
StringTrimRight, loc_title, loc_title, count

Answer 1

You could use sendraw instead of sendinput.
Here is what the docs say:
Raw mode: The SendRaw command interprets all characters literally
rather than translating {Enter} to an ENTER keystroke, ^c to
Control-C, etc. However, the normal rules for escape sequences,
variable references and expressions still apply since these are
processed before the command executes. To use raw mode with SendInput,
SendPlay, or SendEvent, write {Raw} as the first item in the string;
for example: SendInput {Raw}abc.
Then you don't have to worry about the ! or other control modifiers.

Answer 2

The reason that the exclamation mark character is an issue is because SendInput treats it as a code to press the Alt key.
There are several similar codes:
^ = Ctrl
+ = Shift
# = Windows key
You can find the others listed in the documentation for SendInput.
It seems like you want to send the raw text and not have SendInput look for these codes. You should be able to put {Raw} at the beginning of the userinput variable and it will ignore any codes in the rest of the characters.
If it is typing too slowly, you could put SetKeyDelay,-1 in your script to remove the key sending delay.

Answer 3

A good workaround that I found was to avoid SendInput altogether. Rather use the clipboard to copy the string inside, to then paste it on your screen. It works flawlessly, and is a billion times faster. Why would a person utilize SendInput in the first place? However, the actual question still is standing, why does SendInput behave so strangely? What is inside that string: %userInput% that causes my system to crash? How can I find out?