Hi @c.kuekmen,

Thanks for posting here.

I could confirm the issue on my test site therefore notified the theme developer about this so that it will be fixed.

The issue will be fixed ASAP.

In the meanwhile you can try resolving the issue by adding the following CSS code in the Custom CSS code option of your theme on the below path.

Admin Area -> Appearance -> Theme Settings -> Custom Code -> CSS Code

.sh-increase-numbers input,
.sh-increase-numbers span {
    float: none;
    display: inline-block !important;
    width: 30px!important;
    height: 30px;
    color: #000;
}

.sh-increase-numbers span {
    width: auto!important;
    height: auto!important;
    padding: 2px 3px;
    margin: 0 1px;
}

.sh-increase-numbers i {
    line-height: 10px;
}

Best regards,
Shufflehound team