diff --git a/frontend/src/app/components/mempool-blocks/mempool-blocks.component.ts b/frontend/src/app/components/mempool-blocks/mempool-blocks.component.ts
index 0ef7de49e..91273169c 100644
--- a/frontend/src/app/components/mempool-blocks/mempool-blocks.component.ts
+++ b/frontend/src/app/components/mempool-blocks/mempool-blocks.component.ts
@@ -153,6 +153,7 @@ export class MempoolBlocksComponent implements OnInit, OnDestroy {
     this.markBlocksSubscription = this.stateService.markBlock$
       .subscribe((state) => {
         this.markIndex = undefined;
+        this.txPosition = undefined;
         this.txFeePerVSize = undefined;
         if (state.mempoolBlockIndex !== undefined) {
           this.markIndex = state.mempoolBlockIndex;