Azalea Mollis on "[Plugin: Fast Secure Contact Form] Can't change the confirmation email "From" name"

Hi,

I'd like to change the 'Confirmation email "From" name' field in the Advanced settings. After I type the new name and save the settings, the plugin still sends the confirmation email with the old sender name. Do you have any idea what can be the problem? Thanks.

https://wordpress.org/plugins/si-contact-form/