diff --git a/lib/common/static/options_panel.js b/lib/common/static/options_panel.js
index 0cbecf0..2c827e8 100644
--- a/lib/common/static/options_panel.js
+++ b/lib/common/static/options_panel.js
@@ -79,13 +79,14 @@
     stopPendingOrdersPoll();
     const panel = orderPanel();
     const host = orderPanelHost();
+    // 先把面板移回 host，再删行内 tr，避免 tbody.innerHTML 清空时把 #opt-order-panel 一起销毁
+    if (panel && host) {
+      if (panel.parentElement !== host) host.appendChild(panel);
+      host.hidden = true;
+      panel.style.display = "none";
+    }
     const inline = document.querySelector(".opt-order-inline-row");
     if (inline) inline.remove();
-    if (panel && host && panel.parentElement !== host) {
-      host.appendChild(panel);
-      host.hidden = true;
-    }
-    if (panel) panel.style.display = "none";
     document.querySelectorAll(".opt-strike-row").forEach(function (r) {
       r.classList.remove("opt-row-selected");
     });
@@ -774,9 +775,9 @@
     const expMs = document.getElementById("opt-exp-select").value;
     const prevSelected = state.selectedInst;
     const cols = strikeTableColspan();
+    parkOrderPanel();
     tbody.innerHTML = "";
     if (!expMs || !state.chain) {
-      parkOrderPanel();
       tbody.innerHTML = '<tr><td colspan="' + cols + '" class="muted">请选择到期日</td></tr>';
       state.selectedInst = null;
       return;
@@ -785,21 +786,17 @@
       return String(e.exp_time) === String(expMs);
     });
     if (!exp) {
-      parkOrderPanel();
       state.selectedInst = null;
       return;
     }
     const list = filterChainContracts(exp.contracts);
     if (!list.length) {
-      parkOrderPanel();
       const label = moneyFilterLabel();
       const suffix = label ? label : optTypeLabel(state.optType);
       tbody.innerHTML = '<tr><td colspan="' + cols + '" class="muted">该到期日暂无' + suffix + "合约</td></tr>";
       state.selectedInst = null;
       return;
     }
-    const stillVisible = !!prevSelected && list.some(function (c) { return c.inst_id === prevSelected; });
-    if (!stillVisible) parkOrderPanel();
     let matchedSelected = false;
     list.forEach(function (c) {
       const tr = document.createElement("tr");
@@ -829,9 +826,9 @@
     const prevSelected = state.selectedInst;
     const cols = strikeTableColspan();
     const indexPx = state.chain && state.chain.index_px;
+    parkOrderPanel();
     tbody.innerHTML = "";
     if (!expMs || !state.chain) {
-      parkOrderPanel();
       tbody.innerHTML = '<tr><td colspan="' + cols + '" class="muted">请选择到期日</td></tr>';
       state.selectedInst = null;
       return;
@@ -840,14 +837,12 @@
       return String(e.exp_time) === String(expMs);
     });
     if (!exp) {
-      parkOrderPanel();
       state.selectedInst = null;
       return;
     }
     let rows = filterStraddleRows(buildStraddleRows(exp.contracts), indexPx);
     rows = sliceAtmWindow(rows, indexPx);
     if (!rows.length) {
-      parkOrderPanel();
       const label = moneyFilterLabel();
       const suffix = label ? label + "区" : "匹配";
       tbody.innerHTML = '<tr><td colspan="' + cols + '" class="muted">该到期日暂无' + suffix + "行权价</td></tr>";
@@ -855,13 +850,6 @@
       return;
     }
     const atmStrike = findAtmStrike(rows, indexPx);
-    const visibleInsts = [];
-    rows.forEach(function (row) {
-      if (row.call && row.call.inst_id) visibleInsts.push(row.call.inst_id);
-      if (row.put && row.put.inst_id) visibleInsts.push(row.put.inst_id);
-    });
-    const stillVisible = !!prevSelected && visibleInsts.indexOf(prevSelected) >= 0;
-    if (!stillVisible) parkOrderPanel();
     let matchedSelected = false;
     rows.forEach(function (row) {
       const call = row.call;
@@ -1003,7 +991,6 @@
         alert(lastMsg || "加载到期日失败,请点「刷新链」重试");
         return;
       }
-      const keepSel = soft && state.selectedInst;
       const keepExp = soft ? (document.getElementById("opt-exp-select") || {}).value : "";
       state.chain = d;
       panelCache.chain = d;
@@ -1025,8 +1012,8 @@
           sel.value = keepExp;
         }
       }
+      // soft 时保留 selectedInst；renderStrikes 会先 park 再按 prevSelected 静默重挂下单面板
       renderStrikes();
-      if (soft && keepSel) state.selectedInst = keepSel;
     } catch (e) {
       if (seq !== chainLoadSeq || soft) return;
       setExpirySelectStatus("选择到期日");