https://css-tricks.com/almanac/properties/f/flex-wrap/

https://developer.mozilla.org/zh-CN/docs/Web/CSS/flex-wrap

.flex-box {
    border: 1px solid red;
    height: 100px;
    position: relative;
    display: flex;
    flex-flow: row wrap;
    /* flex-wrap: wrap; */
    justify-content: flex-start;
    align-items: stretch;
    align-content: stretch;
    box-sizing: border-box;
    margin: 10px;
}

demo

https://codepen.io/xgqfrms/pen/jjLPKN

Error

.chat-person-contact-others {
    display: flex;
    flex-wrap: nowrap;
   /*default value bug */
}

OK

.chat-person-contact-others {
    display: flex;
    flex-flow: row wrap;
}

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