diff --git a/app/helpers/issuables_helper.rb b/app/helpers/issuables_helper.rb
index 1a471034972..7865d3b28a3 100644
--- a/app/helpers/issuables_helper.rb
+++ b/app/helpers/issuables_helper.rb
@@ -191,7 +191,7 @@ module IssuablesHelper
 
     output << content_tag(:strong) do
       author_output = link_to_member(project, issuable.author, size: 24, mobile_classes: "d-none d-sm-inline")
-      author_output << link_to_member(project, issuable.author, size: 24, by_username: true, avatar: false, mobile_classes: "d-block d-sm-none")
+      author_output << link_to_member(project, issuable.author, size: 24, by_username: true, avatar: false, mobile_classes: "d-inline d-sm-none")
 
       if status = user_status(issuable.author)
         author_output << "#{status}".html_safe
diff --git a/changelogs/unreleased/57829-issuable-meta-line-ui-broken-on-mobile.yml b/changelogs/unreleased/57829-issuable-meta-line-ui-broken-on-mobile.yml
new file mode 100644
index 00000000000..b4b305e76d0
--- /dev/null
+++ b/changelogs/unreleased/57829-issuable-meta-line-ui-broken-on-mobile.yml
@@ -0,0 +1,5 @@
+---
+title: Fix author layouts in issuable meta line UIs on mobile
+merge_request: 25332
+author: Takuya Noguchi
+type: fixed