Red fIt Warning when fitting in MantidPlot window

[VickieLynch]

Fit-[Notice] Fit started
Fit-[Information] Algorithm: Fit v1
Fit-[Information] Parameters:
Fit-[Information] Name: Function, Value: name=Gaussian,Height=10,PeakCentre=1.39396,Sigma=0.0146133, Default?: No, Direction: InOut
Fit-[Information] Name: InputWorkspace, Value: , Default?: Yes, Direction: Input
Fit-[Information] Name: DomainType, Value: Simple, Default?: Yes, Direction: Input
Fit-[Information] Name: Ties, Value: , Default?: Yes, Direction: Input
Fit-[Information] Name: Constraints, Value: , Default?: Yes, Direction: Input
Fit-[Information] Name: MaxIterations, Value: 500, Default?: Yes, Direction: Input
Fit-[Information] Name: OutputStatus, Value: , Default?: Yes, Direction: Output
Fit-[Information] Name: OutputChi2overDoF, Value: 0, Default?: Yes, Direction: Output
Fit-[Information] Name: Minimizer, Value: Levenberg-Marquardt, Default?: Yes, Direction: InOut
Fit-[Information] Name: CostFunction, Value: Least squares, Default?: Yes, Direction: InOut
Fit-[Information] Name: CreateOutput, Value: 0, Default?: Yes, Direction: Input
Fit-[Information] Name: Output, Value: PG3_4844, Default?: No, Direction: Input
Fit-[Information] Name: CalcErrors, Value: 0, Default?: Yes, Direction: Input
Fit-[Information] Name: WorkspaceIndex, Value: 0, Default?: Yes, Direction: Input
Fit-[Information] Name: StartX, Value: 1.3587806149035957, Default?: No, Direction: Input
Fit-[Information] Name: EndX, Value: 1.4291297550807713, Default?: No, Direction: Input
Fit-[Notice] Fit successful, Duration 0.00 seconds
Graph-[Warning] You are overlaying plots from data having differing units!
Graph-[Warning] You are overlaying plots from data having differing units!

X axis and Y axis units are same in Input and Output Workspaces

[VickieLynch]

This issue was originally trac ticket 5704