Fix: Issue #2291 - Resolve registration difficulty latching

Author: YZX0

pallets/subtensor/src/coinbase/block_step.rs

@@ -137,26 +137,26 @@ impl<T: Config + pallet_drand::Config> Pallet<T> {
                     #[allow(clippy::comparison_chain)]
                     if pow_registrations_this_interval > burn_registrations_this_interval {
                         // C. There are not enough registrations this interval and most of them are pow registrations
-                        // this triggers a decrease in the burn cost
-                        // burn_cost --
-                        Self::set_burn(
+                        // this triggers a decrease in the pow difficulty
+                        // pow_difficulty --
+                        Self::set_difficulty(
                             netuid,
-                            Self::upgraded_burn(
+                            Self::upgraded_difficulty(
                                 netuid,
-                                current_burn,
+                                current_difficulty,
                                 registrations_this_interval,
                                 target_registrations_this_interval,
                             ),
                         );
                     } else if pow_registrations_this_interval < burn_registrations_this_interval {
                         // D. There are not enough registrations this interval and most of them are burn registrations
-                        // this triggers a decrease in the pow difficulty
-                        // pow_difficulty --
-                        Self::set_difficulty(
+                        // this triggers a decrease in the burn cost
+                        // burn_cost --
+                        Self::set_burn(
                             netuid,
-                            Self::upgraded_difficulty(
+                            Self::upgraded_burn(
                                 netuid,
-                                current_difficulty,
+                                current_burn,
                                 registrations_this_interval,
                                 target_registrations_this_interval,
                             ),