Sign in errors!

First of all I tested this all using my account. When logging on to my site using this plugin, I get “Incorrect username or password” if I do not do the reCaptcha but all information is accurate. I am wanting to get the error message of “Invalid reCapthca” or something along those lines. The purpose of this would be to simply remind my users to do the reCapthca. I do not want them thinking that they just entered the wrong information when it was indeed accurate. Can anyone help me out in this matter. I have seen this work elsewhere but for some reason I can’t figure it all out. Any help would be appreciated. Thanks!

https://ww.wp.xz.cn/plugins/bwp-recaptcha/