Wrong lead in hind while lunging
I was lunging my mare today (it doesn't happen so often as I don't have a round pen and I have to ask neighbours to use theirs). When I asked her to canter she picked up the right lead, but after half circle she got excited and went into really really fast canter, that's when she messed up with lead in the back. After a circle of craziness I managed to slow her down and she fixed the lead in back and cantered correctly. After few circles the same things happened. She again started the crazy thing with wrong lead in back and fixed it when she slowed down a bit.
It was the same in the other direction.
When she calmed down she cantered correctly, with no problems.
Is this something I should be worried about?
When I ride her she picks the right lead with no problems and keeps it. She also does nice flying lead changes if we are cantering on a S like trail, though I don't know the command. She never just changes the lead if we are cantering on straight road or in circle.