diff --git a/app/components/MobileFundTable.jsx b/app/components/MobileFundTable.jsx
index 7a718a1..f4ce408 100644
--- a/app/components/MobileFundTable.jsx
+++ b/app/components/MobileFundTable.jsx
@@ -354,13 +354,19 @@ export default function MobileFundTable({
       const nextStickyTop = getEffectiveStickyTop();
       setEffectiveStickyTop((prev) => (prev === nextStickyTop ? prev : nextStickyTop));
 
-      const tableRect = tableContainerRef.current?.getBoundingClientRect();
+      const tableEl = tableContainerRef.current;
+      const tableRect = tableEl?.getBoundingClientRect();
       if (!tableRect) {
         setShowPortalHeader(window.scrollY >= nextStickyTop);
         return;
       }
 
-      setShowPortalHeader(tableRect.top <= nextStickyTop);
+      const headerEl = tableEl?.querySelector('.table-header-row');
+      const headerHeight = headerEl?.getBoundingClientRect?.().height ?? 0;
+      const hasPassedHeader = (tableRect.top + headerHeight) <= nextStickyTop;
+      const hasTableInView = tableRect.bottom > nextStickyTop;
+
+      setShowPortalHeader(hasPassedHeader && hasTableInView);
     };
 
     const throttledVerticalUpdate = throttle(updateVerticalState, 1000/60, { leading: true, trailing: true });
diff --git a/app/components/PcFundTable.jsx b/app/components/PcFundTable.jsx
index 3f3b826..c4884ab 100644
--- a/app/components/PcFundTable.jsx
+++ b/app/components/PcFundTable.jsx
@@ -412,7 +412,12 @@ export default function PcFundTable({
         return;
       }
 
-      setShowPortalHeader(rect.top <= nextStickyTop);
+      const headerEl = tableEl?.querySelector('.table-header-row');
+      const headerHeight = headerEl?.getBoundingClientRect?.().height ?? 0;
+      const hasPassedHeader = (rect.top + headerHeight) <= nextStickyTop;
+      const hasTableInView = rect.bottom > nextStickyTop;
+
+      setShowPortalHeader(hasPassedHeader && hasTableInView);
 
       setPortalHorizontal((prev) => {
         const next = {