It seems from a subsequent post that the problem is no longer presentIf I remember things correctly, the situation is following. The filter tm_axiom.c as included in the TeXmacs sources never had this problem. Somebody (Bill Page?) made extensive modifications of the filter, and this modified version was used in Windows (cygwin). The main aim of the modification was to have a better splitting of long formulas into many lines. However, this change introduced a number of bugs, including these spurious brackets. It was never included in TeXmacs. I think some distros decided to use the modified tm_axiom.c instead of the one from TeXmacs.
in version 1.0.7.2. You should therefore consider upgrading.
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