wolfram mathematica - question on Trigger and updating of Manipulate expression -

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experts,

I do not understand why manipulation expression is being evaluated 2 times every time I ' Click on StepRightButton 'which is part of a catalyst control.

When I click on the '+' button, I see the counter is expected to go up once, but the expression is being evaluated twice, not expected once a small one here Example: 

  manipulation [Show [Graphics @ Text line] [[Current time, "", Date []}], Plot [sin [x], {x, -Pi is, Pie }], Control [{{current time, 0, style ["run", 10]}, 0, 100,0.1, ControlType-> Triggers, DisplayAllSteps- & gt; This is true, ImageSize-> Tiny, AnimationRate-> Automatic, AnimationRepetitions- & gt; 0, AppearanceElements-> {"PlayButton", "PauseButton", "StepRightButton", "ResetButton"}}], ContinuousAction-> False, SynchronousUpdating-> Wrong]   
 Again, clicking on '+' increases the 'current time' variable by the correct amount (0.1 in this example). But my question is why the expression is being evaluated twice by the evidence that the date can be seen to increase every 2 times click on the '+' button per printed [].  
 This causes the problem to me, as I was assuming that the expression will evaluate once according to the 'tick'.  
 Is there a way to make sure that expression is evaluated every time you click on '+'?  
 Thanks,   
 
 
 This option can be solved by adding  PerformanceGoal - & gt; From "quality"  to  plot  function.  
 During the display of manipulated items, the object's lower fidelity sample can be shown depending on the  Performance Goal  setting. A high fidelity version is prepared at the end of the manipulation, if necessary. It has been repeated later, which is causing problems here.

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