Why does this integral show a wrong graph

Hi, I'm an 18 year old mechanicalenginering student from Groningen. For a project we need to make a pick and place unit, so I started making some dynamics graphs in mathcad. Only there is one problem the graph is showing. Me, my fellow students or the teachers didn't know what went wrong. The velocity curve shows something odd at the right part of the graph, where it is supposed to go to 0 constantly it drops down right before. Could someone tell me what i did wrong or what is going on?