diff --git a/style/macarchy-bar-contrast b/style/macarchy-bar-contrast
index 04e2b13..5e8f099 100755
--- a/style/macarchy-bar-contrast
+++ b/style/macarchy-bar-contrast
@@ -30,6 +30,9 @@ LIGHT_TEXT="#f5f5f7"; LIGHT_ACTIVE="#ff453a"
 DARK_TEXT="#1d1d1f";  DARK_ACTIVE="#d70015"
 BEGIN="# >>> macarchy-bar-contrast (managed; do not edit)"
 END="# <<< macarchy-bar-contrast"
+# Pre-rename (omarchy-bar-contrast) block: a second [bar] table; strip it on every write.
+LEGACY_BEGIN="# >>> omarchy-bar-contrast (managed; do not edit)"
+LEGACY_END="# <<< omarchy-bar-contrast"
 
 CAPTURE_CMD=${OMARCHY_BAR_CONTRAST_CAPTURE:-}
 SETTLE_GAP=${OMARCHY_BAR_CONTRAST_SETTLE_GAP:-0.5}
@@ -156,13 +159,13 @@ echo "sample=$sample verdict=$verdict text=$text" >&2
 
 current=""
 [[ -f $CONF ]] && current=$(sed -n "/^$BEGIN\$/,/^$END\$/p" "$CONF")
-[[ $current == "$block" ]] && exit 0   # same verdict: no write, no shell reload
+[[ $current == "$block" ]] && ! grep -qxF "$LEGACY_BEGIN" "$CONF" && exit 0   # same verdict: no write, no shell reload
 
 mkdir -p "$(dirname "$CONF")"
 tmp=$(mktemp "$CONF.XXXXXX")
 trap 'rm -f "$tmp"' EXIT
 {
-  [[ -f $CONF ]] && sed "/^$BEGIN\$/,/^$END\$/d" "$CONF" | sed -e :a -e '/^\n*$/{$d;N;ba' -e '}'
+  [[ -f $CONF ]] && sed -e "/^$BEGIN\$/,/^$END\$/d" -e "/^$LEGACY_BEGIN\$/,/^$LEGACY_END\$/d" "$CONF" | sed -e :a -e '/^\n*$/{$d;N;ba' -e '}'
   [[ -f $CONF && -s $CONF ]] && echo
   printf '%s\n' "$block"
 } > "$tmp"
diff --git a/tests/test_bar_contrast.sh b/tests/test_bar_contrast.sh
index e8d8fb8..8eb749a 100644
--- a/tests/test_bar_contrast.sh
+++ b/tests/test_bar_contrast.sh
@@ -116,4 +116,15 @@ check "no capture tool is a skip, not a failure" [ "$rc" -eq 0 ]
 check "and it says why"                          grep -q 'nothing to sample' <<<"$err"
 check "and it leaves the config untouched"       [ "$(cat "$CONF")" = "$before" ]
 
+# --- the pre-rename block is stripped -----------------------------------------
+# The rename to macarchy-core changed the markers; the old omarchy-bar-contrast
+# block was left behind as a second [bar] table (invalid TOML), and the no-op
+# exit meant an unchanged verdict never cleaned it up.
+printf '[font]\nbase-size = 14\n' > "$CONF"
+"$SCRIPT" --sample '#040407' >/dev/null 2>&1
+printf '\n# >>> omarchy-bar-contrast (managed; do not edit)\n[bar]\ntext   = "#f5f5f7"\nactive = "#ff453a"\n# <<< omarchy-bar-contrast\n' >> "$CONF"
+"$SCRIPT" --sample '#040407' >/dev/null 2>&1
+check "legacy block stripped on an unchanged verdict" \
+  [ "$(grep -c '^\[bar\]$' "$CONF")" -eq 1 ]
+
 echo; [[ $fails -eq 0 ]] && echo "all passed" || { echo "$fails failed"; exit 1; }