You have an app, most likely a font overriding that, on my test server I see the arrows on checkout using 2024

Ah you’re using WooCommerce Blocks. That’s why.

Here’s the fix for that. Although I don’t know why it’s happening. It was a bug a year or so ago if I remember correctly.

If you know how to add CSS then add this. If you don’t know where to add this let me know and I will advise you better.

.wc-block-components-state-input,
.wc-block-components-country-input{
    position:relative;
}
.wc-block-components-state-input:after,
.wc-block-components-country-input:after {
    height: 0.5em;
    width: 0.5em;
    content: '';
    position: absolute;
    right: 1em;
    top:25px;
    border-left: 1px solid grey;
    border-bottom: 1px solid grey;
    transform: translateY(-50%) rotate(-45deg);
}