Update Data Merge content with Multiple Master Pages missing text

Hello, I created a weekly planner based on data marged from excel file, saved as .csv ( I tested also .txt. file and there is the same problem). It works OK, but when I click update content in data field same of my text boxes using data marge disapeard. 

When I have a new document and one master  page this problem also exist, and always when I update data field some of thise fields disappeard. 

I attached screen with my master page, next is merged document with 52 pages looking good, and the last screen after update data ( basen on the same file with no data changed ).

Pleas help