ATLANTA (AP) — Mercedes-Benz Stadium has a bit of water dripping on to the sideline, seemingly coming from high above the field.

Around the 20-yard line on Alabama’s side of the field, but off the playing field, a few drops could be spotted falling on to the green artificial turf.

A stadium security worker wearing a blue shirt was standing where the water was landing and had wets spots on his shirt.

There have been issues with the stadium’s signature retractable roof since construction began on the facility. The roof has only been opened once for football since the stadium opened in August.