clear table before adding rows

index.html

···
     </form>
 
     <table class="scan-result given-likes">
-      <tr><th colspan="2">Given likes:</th></tr>
+      <thead>
+        <tr><th colspan="2">Given likes:</th></tr>
+      </thead>
+      <tbody></tbody>
     </table>
 
     <table class="scan-result received-likes">
-      <tr><th colspan="2">Received likes:</th></tr>
+      <thead>
+        <tr><th colspan="2">Received likes:</th></tr>
+      </thead>
+      <tbody></tbody>
     </table>
   </div>
 

like_stats_page.js

···
   }
 
   async renderResults(counts, table) {
+    let tableBody = $(table.querySelector('tbody'));
+    tableBody.innerHTML = '';
+
     let entries = Object.entries(counts).sort(this.sortResults).slice(0, 20);
 
     for (let [user, count] of entries) {
···
         $tag('td', { text: count })
       );
 
-      table.append(tr);
+      tableBody.append(tr);
     };
   }