I have see this when the material is not flat when your machiing. The material will lift up when the tool / machine stops at the end of the cut/stepover. Definitaly a process issue, not the tool path. Creating a 2nd pass to finish the floor may help. If the stock is not flat the problem will persist.
John Joyce, Manufacturing Engineer, Senior Aerospace
NX 22.214.171.124 Vericut 8.0.3 - Statements and opinions are mine alone and do not reflect the opinion of my employer or any other member of the human race