Hurdle height screwup

[Altor]

High School conference meet -- Boys 300 Intermediate hurdle semifinals. Seven runners on a six lane track qualifying on time only (i.e. running two heats to eliminate 1 competitor).

After the first heat, the hurdle crew realizes that the fifth flight of hurdles is not set at the correct height. Instead of leaving them so that times are comparable, they raise them to the correct height just before the second heat.

As the referee, what are your options.