Alpha caps don't fit in Serial page boxes

[BoscoBilly]

Hello:
I am using the script below to setup my serial number page.
I use a 16 char string of cap A/N chars in 4 fields of 4.
The problem is that the boxes are too small for a 3/4 char sequence of certain alpha caps. Only the first 2 or 3 chars are visible. The 3rd 4th char cannot be seen, tho it is there.
Could someone help me fix this?
Thanks.

if, e.g., WWW is typed in one 4-char box,only the first 2 W's are visible.
for WWA, all three can be seen. For III1, all four can be seen.
Below is the script.

!insertmacro UMUI_SERIALNUMBERPAGE_ADD_LABELEDSERIAL SERIALNUMBER 4444 "NODASHS" $R2 "$(UMUI_TEXT_SERIALNUMBER_SERIALNUMBER)"