diff --git a/ms2rescore/core.py b/ms2rescore/core.py
index 40ab46a..2b25d7d 100644
--- a/ms2rescore/core.py
+++ b/ms2rescore/core.py
@@ -175,12 +175,8 @@ def _fill_missing_precursor_info(psm_list, config):
         get_missing_values(psm_list, config, rt_required=rt_required, im_required=im_required)
 
     # Check if values are now present
-    for value_name, required in zip(
-        ["retention_time", "ion_mobility"], [rt_required, im_required]
-    ):
-        if not required:
-            continue
-        if (
+    for value_name, required in [("retention_time", rt_required), ("ion_mobility", im_required)]):
+        if required and (
             0.0 in psm_list[value_name]
             or None in psm_list[value_name]
             or np.isnan(psm_list[value_name]).any()
diff --git a/ms2rescore/report/generate.py b/ms2rescore/report/generate.py
index 400fb15..d74399e 100644
--- a/ms2rescore/report/generate.py
+++ b/ms2rescore/report/generate.py
@@ -180,13 +180,12 @@ def _get_stats_context(confidence_before, confidence_after):
         if not before or not after:
             continue
         increase = (after - before) / before * 100
-        diff = after - before
         stats.append(
             {
                 "item": level_name,
                 "card_color": card_color,
                 "number": after,
-                "diff": f"({diff:+})",
+                "diff": f"({after - before:+})",
                 "percentage": f"{increase:.1f}%",
                 "is_increase": increase > 0,
                 "bar_percentage": before / after * 100 if increase > 0 else after / before * 100,