Just because all of your irrigation heads are working does not mean that they are working efficiently.
Over time, heads get pushed into the ground and get out of plumb or become crooked. They will need to be ” RESET” . This is simply digging up the heads and resetting them. Make sure they are plumb and doing their job.
Always make sure those sprinkler heads are straight and projecting water in the appropriate spots.
If we can help call Bruce hage Irrigation at 407-275-0804