Why TRP exceed input power

I would like to know why TRP exceed input power.

I'm working on Antenna simulation on the tutorial. Specifically, I modeled half-wave dipole antenna and found something wrong with the results when I moved on to the analysis. I ticked the box to normalize the input power and tried to check radiation report. I found TRP exceeds input power.

There is a kind of warning that says ''Total radiated (TRP) and input power values provided at the input are not accurate. TRP is greater than the input power at some frequency snapshot.''

Could anyone help me solve the problem?

I'm using FDTD on Sim4LifeLight V

Thank you very much in advance.