Y axis belt length

I am currently assembling a prusa mk2 kit that arrived in January 2017. When assembling the belt on the y axis I find that when the belt is tightened to adequate tension there is much more excess belt leaving the belt holder than is shown in setup image 31. When the stage approaches the end stop this excess belt winds into the y motor pulley and stops the stage from smoothly reaching the end stop. I have the belt currently fitted so that equal amounts of this excess belt leave the belt holder from each side but the problem persists. In the instructions it specifically states not to cut the belt so I assume it is manufactured to be the correct length. Is this a common issue? Should I go ahead and trim the belt so it's excess length resembles that in the step 31 image?

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