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Probably the theme.css

As cache is enabled, I can't detect which file it is. Update the CSS as below.

.image-slider-block .caption .caption-description {
    /* display: block; */
    /* max-width: 425px; */
    /* width: 100%; */
    text-align: center;
    /* float: right; */
    /* margin-right: 180px; */
}

.image-slider-block ul>li:first-child .caption .caption-description {
    /* float: left; */
    /* margin-left: 180px; */
    /* margin-right: 0; */
}

Or, you can work on the custom.css as @Divine mentioned...