diff --git a/tools/system-analyzer/map-processor.mjs b/tools/system-analyzer/map-processor.mjs
index e2108dbc9b..17a4b01112 100644
--- a/tools/system-analyzer/map-processor.mjs
+++ b/tools/system-analyzer/map-processor.mjs
@@ -337,7 +337,7 @@ class MapLogEvent extends Event {
 
   position(chunks) {
     let index = this.chunkIndex(chunks);
-    let xFrom = (index + 0.5) * kChunkWidth;
+    let xFrom = (index + 1.5) * kChunkWidth;
     let yFrom = kChunkHeight - chunks[index].yOffset(this);
     return [xFrom, yFrom];
   }
diff --git a/tools/system-analyzer/timeline/timeline-track.mjs b/tools/system-analyzer/timeline/timeline-track.mjs
index ee514a19b1..7c2c86e434 100644
--- a/tools/system-analyzer/timeline/timeline-track.mjs
+++ b/tools/system-analyzer/timeline/timeline-track.mjs
@@ -240,7 +240,7 @@ defineCustomElement('./timeline/timeline-track', (templateText) =>
         if (chunk.isEmpty()) continue;
         let node = this.div();
         node.className = 'chunk';
-        node.style.left = (chunks[i].start * this.#timeToPixel) + 'px';
+        node.style.left = ((chunks[i].start - start) * this.#timeToPixel) + 'px';
         node.style.height = height + 'px';
         node.chunk = chunk;
         node.addEventListener('mousemove', e => this.handleChunkMouseMove(e));