Hello, I have found one more bug related to column theme, when something is pasted in activity box loader cuts icons in half, same thing happens on your demo site js-column.demo.joomlart.com/index.php
Problem is loader disappears to fast and I cant identify what css is the issue.

Check screenshots for clarification

Thank you!

.joms-postbox-tabs .joms-postbox-status .joms-postbox-tab .joms-postbox-loading {}
defined in js-column.demo.joomlart.com/components/c...assets/css/style.css
line 2999 and 3422

.joms-postbox-tab > div {
    padding: 12.36068px;
    display: inline-block;
    cursor: pointer;
    text-align: center;
    position: relative;
    vertical-align: middle;
}
.joms-postbox-loading {
    position: absolute !important;
    background: #FFFFFF;
    left: 0px;
    right: 0px;
    bottom: 0px;
    text-align: center;
    display: block;
    height: 32px;
}

Thank you Vladimir this is the culprit:

position: absolute !important;