diff --git a/dvc/repo/experiments/show.py b/dvc/repo/experiments/show.py
index 6a2556b692..39ac7e66d9 100644
--- a/dvc/repo/experiments/show.py
+++ b/dvc/repo/experiments/show.py
@@ -66,7 +66,8 @@ def _collect_experiment_branch(res, repo, branch, baseline, **kwargs):
                 exp.update(collected_exp)
         else:
             exp = collected_exp
-        res[rev] = exp
+        if rev not in res:
+            res[rev] = exp
         prev = rev
     if len(revs) > 1:
         res[prev]["checkpoint_parent"] = baseline