This happened to me twice, so better bring this up. It's especially common with small cc bikes.
Everyone stop at red traffic light, 2 bikes are the first, one of each side of the lane. Then green turn right light is shown.
Both bikes moved to turn, but bike on the left chose to go turn in "a straight line" manner, which essentially cutting into right lane. Reason? "Shortest path to go is a straight line" or "my bike is faster than yours" mentality.
See the pic attached.
This will cause the bike on the right either to jam brake or hit the bike in front.