I have re-uploaded and removed the nulled but for those that do not want to reinstall here is a quick fix for the issue (if you want to remove it.
AdminCP > Customize > Themes > Select the one that it says AdminCP Default > Edit HTML & CSS > CSS > custom.css
Insert this
.nulled {
line-height: 32px;
text-transform: uppercase;
color: rgba(255, 255, 255, 0.26);
visibility: hidden;
}
SAVE.
Make sure you apply it to the theme that has AdminCP Default, not the normal theme.