If the same happens when using an external USB keyboard, it could be a software or setting issue. Then go back to factory conditions and try again.
If an external keyboard functions OK, try replacing the keyboard in the laptop.
I am no longer able to type double letters/numbers or even use the backspace or arrow keys properly. If I try to type double letters (for example, the t's in letter), I have to either hit the space bar and then the backspace key to get the cursor back to the proper position after the first t to continue typing the next t or I have to arrow back to just before the first t that I typed so that it will allow me to type the second t then hit the END key to get the cursor back to the correct position to continue typing. (Hopefully that made sense!)
But the really strange, and frustrating, part about this is that this issue does not happen if I hold down the shift key while I type.
I have already tried the following in hopes of correcting this issue:
Adjust my key's typing delay speed - no change
Turn of my filter/sticky keys - no change
Clean out my keyboard - no change
Uninstall my keyboard driver and reboot - no change
Perform a system reset - no change
Anyone have additional ideas to solve this problem or what the issue may be?