Why does my computer keyboard type different characters from the keys?

A useful first distinction is whether particular keys consistently produce unexpected characters, or whether a key combination behaves unexpectedly. One common explanation is that the active keyboard layout differs from the layout printed on the keys or the one you expect. The active layout can differ from the computer’s display language. In Windows, look for the input-language indicator in the taskbar; Windows logo key+Spacebar cycles through installed layouts. [S1]

Try a key whose expected character is easy to recognize, then check the indicated layout before changing settings. If switching layouts resolves the mismatch, that points to the active layout as the explanation. If it does not, keep checking rather than assuming the keyboard is faulty.

In Windows 10 or 11, open Settings > Time & language > Language & region and review the installed languages and keyboard layouts. You can add, select, or remove layouts there. [S1] Make sure the selected layout is the one you intend to use; do not remove a layout unless you are sure you do not need it.

For example, suppose you intend to use a layout labeled “English (United States)” but the taskbar indicator shows another installed layout. Switch to the intended one using the indicator or Windows logo key+Spacebar, then test the same few keys again. The labels are examples, not a claim about which layout is right for you. If you need more than one layout, check which one is active before typing, particularly after using the shortcut.

Check whether a modifier key is being held down or sticking, and note whether the issue happens with a single key or only with combinations. Then, in Windows, inspect Settings > Accessibility > Keyboard. Sticky Keys lets you enter multi-key commands one key at a time, while Filter Keys changes sensitivity and can ignore brief or repeated keystrokes. [S2] These features can affect how combinations or keystrokes are handled, but the cited guidance does not say they change ordinary key-to-character mapping. Check the layout separately if ordinary letters or symbols are wrong.

If you find an accessibility option enabled, note its current state before changing it. Change one setting at a time, then repeat the same small test. This helps you tell whether that change affected the behavior. These checks may narrow down the issue, but they do not identify every possible modifier-key or hardware problem.

Use a small repeatable test rather than changing several settings at once:

1. Open a place where you can type without sending or submitting anything.
2. Press a few affected keys individually; note each key pressed and the character shown.
3. Check the active layout and switch to the intended one if necessary; repeat the same keys.
4. If the layout is right, check modifier keys and Windows keyboard accessibility options. Change only one relevant setting at a time and retest.
5. If the mismatch remains, record the application, active layout, affected keys, whether combinations are involved, and any setting you changed.

Copyable note: “Expected layout: [name]. Active layout shown: [name]. Key pressed: [key]. Character shown: [character]. Happens with: [single key / combination]. Accessibility setting checked or changed: [setting and state].” This record can help you describe the issue, but the checks do not prove whether the keyboard needs repair.