Dear Hans, Here is a small example which shows a strange spacing in the aligned display math mode. The same code is OK in both inline mode and just display mode, but it is not good in aligned mode. I hope that it helps your fix . Thank you. Best regards, Dalyoung %%%%% running luametatex version 2.03.3, ConTeXt ver: 2019.12.12, format: 2019.12.14 %%%%% \starttext \startitemize \head inline formula: $1001 \times 23 \equiv 1 \quad \pmod {3837}$ \head display mode \startformula 1001 \times 23 \equiv 1 \quad \pmod {3837} \stopformula \head aligned display mode \startformula\startalign[m=2] \NC 2^7 \equiv \qquad \NC \pmod {341}, \NC 14^7 \equiv \qquad \NC \pmod {341}, \NR \NC 11^7 \equiv \qquad \NC \pmod {341}, \NC 3^7 \equiv \qquad \NC \pmod {341}, \NR \stopalign\stopformula \startformula\startalign[n=3] \NC 1001 \times 23 \NC \equiv 1 \quad \NC\pmod {3837} \NR \NC \qquad \times 23 \NC \equiv \qquad \NC\pmod {3837} \NR \stopalign\stopformula \stopitemize \stoptext