1)
I thought I covered hiding the segments in Row Order videos.
Let me know if that is not the case.

2)
Verify that the format is entered correctly.
For example 9,999.99 or 9,999,999.99.
Your format mask may not be large enough.
Verify that the width of the column (the distance between the
position number of this column and the position number of the next
column) is large enough for the amount to print.
You may have to adjust the widths of these columns by changing the
position numbers through Columns window or directly from Builder Set window.

3)
Make sure the profile options Currency:Positive Format and
Currency:Negative Format have values (at Site level).
Valid values for Currency:Negative Format are (XXX), , -XXX or XXX-.
Valid values for Currency Positive Format are XXX, +XXX or XXX+.

4)
That could be because of different format masks used in Row Sets.