diff --git a/src/item.cpp b/src/item.cpp
index 1dc503263ce9c..f7aab5d9f3a45 100644
--- a/src/item.cpp
+++ b/src/item.cpp
@@ -8124,6 +8124,7 @@ bool item::reload( Character &u, item_location ammo, int qty )
         return false;
     }
 
+    bool ammo_from_map = !ammo.held_by( u );
     item_location container;
     if( ammo->has_flag( flag_SPEEDLOADER ) ) {
         container = ammo;
@@ -8215,6 +8216,9 @@ bool item::reload( Character &u, item_location ammo, int qty )
 
         put_in( *ammo, item_pocket::pocket_type::MAGAZINE_WELL );
         ammo.remove_item();
+        if( ammo_from_map ) {
+            u.invalidate_weight_carried_cache();
+        }
         return true;
     }
 
@@ -8224,6 +8228,9 @@ bool item::reload( Character &u, item_location ammo, int qty )
             u.inv->restack( u ); // emptied containers do not stack with non-empty ones
         }
     }
+    if( ammo_from_map ) {
+        u.invalidate_weight_carried_cache();
+    }
     return true;
 }
 
@@ -8721,6 +8728,8 @@ int item::fill_with( const item &contained, const int amount )
         debugmsg( "tried to put an item (%s) in a container (%s) that cannot contain it",
                   contained_item.typeId().str(), typeId().str() );
     }
+    on_contents_changed();
+    get_avatar().invalidate_weight_carried_cache();
     return num_contained;
 }
 
diff --git a/src/pickup.cpp b/src/pickup.cpp
index d9f8725e38232..bb4d200f6c1c4 100644
--- a/src/pickup.cpp
+++ b/src/pickup.cpp
@@ -369,6 +369,8 @@ bool pick_one_up( item_location &loc, int quantity, bool &got_water, bool &offer
             loc.remove_item();
         }
         player_character.moves -= moves_taken;
+        player_character.flag_encumbrance();
+        player_character.invalidate_weight_carried_cache();
     }
 
     return picked_up || !did_prompt;
diff --git a/src/player.cpp b/src/player.cpp
index 91ecb1ef57d93..cfbca279c54a0 100644
--- a/src/player.cpp
+++ b/src/player.cpp
@@ -2433,6 +2433,7 @@ bool player::unload( item_location &loc, bool bypass_activity )
 
         if( changed ) {
             it.on_contents_changed();
+            invalidate_weight_carried_cache();
         }
         return true;
     }