Hello,

1. Try to add the following code snippet to the Custom CSS area in Theme Settings to fix this issue.

.mc4wp-form-fields .mc4wp-terms {
    margin-left: 0;
    margin-right: 0;
    width: 100%;
    margin-bottom: 0 !important;
}
.mc4wp-form-fields .mc4wp-terms label {
    display: block;
}

2. Please check the issue on one of the default themes to understand where our theme causes the problem.

Best Regards