Strange TAB issue with ACF OPTION page only about acf-qtranslate

[esiao]

I had the same issue and found a solution.
What is happening is that editor.css is not loading on that page. Therefore the styles on the tabs are not applied.

To fix this you can use ACF hook acf/input/admin_head

And add the missing styles

function my_acf_admin_head() {
    ?>
    <style media="screen">
        .wp-switch-editor {
            float: left;
            -webkit-box-sizing: content-box;
            -moz-box-sizing: content-box;
            box-sizing: content-box;
            position: relative;
            top: 1px;
            background: #ebebeb;
            color: #777;
            cursor: pointer;
            font: 13px/19px "Open Sans", sans-serif;
            height: 20px;
            margin: 5px 0 0 5px;
            padding: 3px 8px 4px;
            border: 1px solid #e5e5e5;
        }
    </style>
    <?php
}

A better solution would be to find out why editor.css is not loaded.