If you are having problems with website fields (for example, signing into the TaxAct website) and you are certain you are typing the correct information and you have turned off all auto form fill-in or auto correct settings in the browser, then you may have third-party software on the computer that is interfering.
Norton Identity Safe is an example of third-party software that can interfere with what you are trying to type in a field on a website. This software can override your form entry for other programs such as web browsers and this may cause incorrect submission. You would need to consult help or resources for the software, or temporarily disable it.
You may need to check for any other software or hardware settings that can affect input, such as for security, language or keyboard mapping.