Keyboard shift keys are typing out (LShift)’$’ and (RShift)’?’ with no other input

Troubleshooting Unexpected Character Input from Shift Keys on Logitech K480 Keyboard

Introduction

Many users rely on their keyboards for both work and gaming, expecting consistent and predictable input. However, some Logitech K480 keyboard users have reported an unusual issue: pressing the left or right Shift keys results in unintended characters such as a dollar sign ($) or question mark (?). This unexpected behavior can interfere with normal typing, gameplay, and overall productivity. In this article, we’ll explore the potential causes of this problem and provide practical solutions to restore normal keyboard functionality.

Understanding the Issue

The Logitech K480 is a versatile multi-device keyboard often used across different platforms. When pressing only the Shift keys, instead of executing the expected shift function, users observe the input of specific characters—namely, the dollar sign ($) when pressing the left Shift and a question mark (?) with the right Shift. This suggests that the keyboard may be interpreting the Shift key presses as character inputs rather than modifier commands.

Potential Causes

Several factors could lead to this strange behavior:

Keyboard Firmware or Driver Glitches: Outdated or corrupted firmware/drivers can cause misinterpretation of key functions.
Incorrect Keyboard Layout Settings: The system’s input language or keyboard layout settings might be mismatched, causing certain keys to produce unintended characters.
Hardware Malfunction: Physical issues within the Shift keys themselves could lead to erroneous signals being sent to the computer.
Custom Key Mappings or Software Conflicts: Third-party software, such as keyboard remapping tools or gaming overlays, may interfere with standard key functions.

Step-by-Step Troubleshooting

To address this issue, follow these systematic steps:

1. Verify Keyboard Layout and Language Settings

Windows:
Navigate to Settings > Time & Language > Language.
Ensure your preferred language is selected.
Click on “Keyboard” options and verify the layout matches your physical keyboard (e.g., US QWERTY).
Mac:
Go to System Preferences > Keyboard > Input Sources.
Confirm that the correct input source is active.

2. Update Drivers and Firmware

Visit Logitech’s official website and download the latest drivers and firmware updates for the K480 keyboard.
Use Logitech’s support tools or software (such as Logitech Options) to check for firmware updates and recalibrate the device if available.

3. Test on Different Devices and Applications