diff --git a/src/InSillyCloWeb/assemblies/templates/assemblies/simulatorjob_detail.html b/src/InSillyCloWeb/assemblies/templates/assemblies/simulatorjob_detail.html
index 5b7bb3d88e813fb8a450463eb2eda448b76436ac..48844e710894269b7e16ec3972b153fb10ba9261 100644
--- a/src/InSillyCloWeb/assemblies/templates/assemblies/simulatorjob_detail.html
+++ b/src/InSillyCloWeb/assemblies/templates/assemblies/simulatorjob_detail.html
@@ -40,8 +40,11 @@
     <div class="card card-result context-simulator">
         <div class="card-header">
             Simulate Verification
-            <a class="btn btn-auto {%if not object.pcr_image_url%}collapsed{%endif%}" data-bs-toggle="collapse" href="#verification" role="button"
-               aria-expanded="false"
+            <a class="btn btn-auto {%if not object.pcr_image_url%}collapsed{%endif%}"
+               data-bs-toggle="collapse"
+               href="#verification"
+               role="button"
+               aria-expanded="{{ object.pcr_image_url|yesno:'true,false' }}"
                aria-controls="verification">
                 <i class="bi bi-chevron-down is-collapsed fs-6"></i>
                 <i class="bi bi-chevron-up is-expended fs-6"></i>
@@ -50,7 +53,7 @@
         <div class="card-body">
             Simulate the agarose gel obtained after a PCR or a restriction digestion reaction.
         </div>
-        <div class="{%if not object.pcr_image_url%}collapse{%endif%} border-top border-simulator" id="verification">
+        <div class="collapse {%if object.pcr_image_url%}show{%endif%} border-top border-simulator" id="verification">
             {%if object.pcr_image_url%}
             <div class="card-header">
                 PCR gel simulation