diff --git a/theme/boost/scss/moodle/forms.scss b/theme/boost/scss/moodle/forms.scss
index 56f9d223c32..86642a92a9e 100644
--- a/theme/boost/scss/moodle/forms.scss
+++ b/theme/boost/scss/moodle/forms.scss
@@ -415,3 +415,9 @@ textarea[data-auto-rows] {
         display: none;
     }
 }
+
+// The autocomplete popup needs a display:block container to correctly position to popup.
+.form-inline[data-fieldtype="autocomplete"],
+.form-inline[data-fieldtype="tags"] {
+    display: block;
+}