Steps to Reproduce

1. import the attached file
2. quickly scroll down to show row 200 by dragging the scrollbar, and wait for rendering completes
3. quickly smoothly scroll right (cannot scroll to jump to another block) to show column DJ

Current Result

cells' positions don't align to their column heading

the cell has "+ Mexico", AC5:AG5, is the first merged cell that is rendered wrong

Expected Result

render cells correctly
 

Debug Information

• if you slowly scroll down, you cannot reproduce this bug
• The error only happened when "AF" column is missed to render. (quick scroll down to the bottom, and smoothly scroll to right, not jump to right)
  If "AF" column is not rendered, the alignment is wrong.