Nested LOOKUP function returns incorrect data

I setup this function to pull my staff's schedule an auto generate the forms i need however the lookup function works properly sometimes and improperly others i checked the syntax and it is correct how ever the wrong data is continually returned. I have attached the file if anyone can help. the VISUAL PLAN tab is the one contaning the formula and it pulls data from PLAN, CURENT SCHEDULE, AND CATAGORY SUMMARY however the only formulas hat i have a problem with are the ones referencing CURENT SCHEDULE please help