I have 2 Sterling toilets that are shooting water inside the tank.

Lift the toilet lid up, flush the toilet and see water is shooting from it might be from the small fill tube not connected to the overflow tube or it may be leaking from the toilet fill vale see the images below, once check that come back and we will tell how to fix it, Thanks.

John

Below the blue cap and above the yellow tube

Tighten the screws on top of the cap and see if it will help, If not close the angle valve under the toilet tanks remove the screws inspect the seal for damge if no damage found turn the seal and install is see if the problem is fixed if not take the seal to a home depot or lowe's get new ones, but I will suggest to replace both fill valve with the fluidmater ones they are more reliable and doesn't cost much see the image below, Thanks

John