All your comments got me curious, so I went back into a Practice round with Holes 11 & 18. I play all my rounds on Pro difficulty.
Definitely the two holes I remember it happening on, but no matter what I did I could not recreate it on Hole 11. Under Breezy conditions (4th round), I'm sure I was using a 5-Iron from the default tee location. If the wind was crossing, I would have been aiming up to 25 feet away from the pin in the direction the wind was blowing from. Regardless, I couldn't hit the shrubbery after several tries and alignments. I'm wondering if there's just a random shrubbery pixel hanging out there that I happened to clip the one time. Oh well...
As far as Hole 18 is concerned, my default Driver stance is 3 clicks down from the game's default. I rarely change it for any reason. From the default tee location, aiming center/right, I was able to clip the shrubs at least three times in about 10 swings. I'll try to add this pre-swing "check" to my routine, but it's so rare that I'll likely forget in short order...