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SWMM Interface Accuracy - Simple Glitch??

When rainfall data recorded at the time it falls (see below for example), rather than at a set timestep is entered into my model, there appears to be an error within the precipitation table and precipitation timeseries (see attachment for example). The reporting timestep is set at 1 hour, and the raingauge time interval is set at 1 minute.Site Yr Mth Day Time Rain (mm)540444 2009 02 13 2 27 1540444 2009 02 13 2 36 1540444 2009 02 13 2 39 1540444 2009 02 13 2 45 1540444 2009 02 13 2 55 1540444 2009 02 13 3 01 1SWMM however still seems to produce accurate flow volumes through conduits and produces hydrographs as would be expected with the rainfall data entered. Is this simply a glitch in the reporting interface, and can SWMM therefore accurately use precipitation data in this format??

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