Rows with column totals over 20 units wrap cells incorrectly

On the current default template, rowgroups with column totals greater than 20 are overflowing into separate rows -- e.g.

; 1.c10 + 1.c10

prints as two cells side-by-side, while

; 1.c10 + 1.c11
; 1.c20 + 1
; 1.c20 + 1.c10 + 1.c5

each print as full-row cells stacked on top of one another.

However, this correctly prints as a single full row:

; 1.c21