Millisecond Forums

I have a trial that runs like so:

<trial wordy>
/ stimulustimes = [0=word, wordPort; 50=ZeroPort; 800=erase, breakPort; 850=ZeroPort]
/ trialduration = 1600
</trial>

Unfortunately the second zero port shows on my output that from the breakPort to the ZeroPort the duration is about 16ms instead of the 50ms it should be.

Is there something I am not understanding for the coding?