The data in the table disappears if I scroll around by dragging the scrollbar, and reappears as soon as I release my mouse button. However the data stays visibl

The data in the table disappears if I scroll around by dragging the scrollbar, and reappears as soon as I release my mouse button. However the data stays visible if I use my scroll-wheel while the pointer is over the data. I'm currently on Firefox 61.0.1 on Kubuntu.