Keyloggers are often undetected, but they can cause various keyboard issues. Remember, keyloggers are common and they can change your keyboard settings. Your keyboard might type the wrong characters due to malware infections. Viruses can be the source of many issues. The width of the X will be input from the user, and must be a value. Some word processing programs will not recognize these Alt functions. As always, scan for viruses, malware, etc. The Xs will be built of asterix symbols (the character above the number 8 on the keyboard). There are some gaps in the numerical sequence of Alt character codes, because either those elements do not exist, or they are duplicates of elements listed elsewhere.
ASTERIX CHARACTER KEYBOARD CODE
To type a special character, using an Alt keyboard sequence: Special Characters - Alt Keyboard Sequences Character