Missing right borders in the top frozen area

Steps to Reproduce

1. load the file with maxVisibleColumns="9"

Current Result

Expected Result

the border exists

Debug Information

• the problem is: when scrolling down, those right borders of lower cells move up and look like an extra border.
  
• keikai renders the non-frozen area 1px wider than the top frozen.
• This bug doesn't happen in all frozen rows, frozenRows.xlsx doesn't have this bug.

Workaround

A.
maxVisibleColumns="10"

B.
set white right border on H1:H5 with the css below
.zstop.zsfztop

{ overflow: visible; }

This will produce a double-selection box issue under frozen rows.
C.
.zsdata

{ overflow: hide }