Hi, I've been fighting with an issue that seems to only affect Firefox. The CSS rules that governs height and top are not being taken into consideration. I followed execution and they seem to being added correctly to the sheet, I even got the selector being added while debugging the execution

".grid-stack-instance-8712 .grid-stack-item[data-gs-height="1"]"

and the value, but once it loads the widgets don't show the rule on the Style panel and the widgets show a height of 0. I checked the node height and y values and they are correct.

This doesn't happen on Chrome.