It rounds the corners based off of 2 css selectors which select the cells in the last row, first column and last row, last column to apply the styling to each. Some browsers seem to pick which one runs first, and because that particular table is a single column table, it ends up changing the same cell twice, it could end up the left or right corner depending on which selector gets interpreted by the browser last. I know how to fix it, I've just been refraining from modifying live stuff. It'll be fixed soon