I changed the formatting on spreadsheet including color filling, add border,
bolding fonts, wrap text and merge cells, then I saved the file. Nearly all
cells are updated except for one merged cell. When I re-open the saved file,
this merged cell with all the above described formats did not change. Please
help with your recommendation what may be the possible errors.

By the way, the spreadsheet is unprotected, unlocked, and saved under a
network drive.

Thanks,

TThai