Well generally invasions are stopped when they end, as posted before the person who reported invasion may go before it finishes, but usually someone who has TIPS and went to invasion will switch it off. However in quieter times this may take sometime.
It's frustrating jump to dist thinking its invasion time only to find it ended ages ago, but thats life its happened to me on more than one occasion, just close invasion report and carry on, there will be times when you go to reported dist and get what you wanted.
There is no way round this, TIPS realies on its users to start and stop legitimate invasion reports, it does not monitor or link with toontown server in anyway, so can not stop invasions unless someone clicks finish.
'Keep it Kool

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