diff --git a/contracts b/contracts
index 004d466a3..c2575aa26 160000
--- a/contracts
+++ b/contracts
@@ -1 +1 @@
-Subproject commit 004d466a3d593e6304e52c74e6c3e801b6a33b32
+Subproject commit c2575aa268734ab6bd03955c6545bd634516e262
diff --git a/monitor/utils/events.js b/monitor/utils/events.js
index 812d0f119..6dd751a5f 100644
--- a/monitor/utils/events.js
+++ b/monitor/utils/events.js
@@ -101,6 +101,21 @@ async function main(mode) {
     chain: 'home'
   })).map(normalizeEvent)
   homeToForeignRequests = [...homeToForeignRequests, ...homeToForeignRequestsNew]
+  if (bridgeMode === BRIDGE_MODES.ARBITRARY_MESSAGE) {
+    const used = {}
+    const total = homeToForeignRequests.length
+    const onlyFirstUniqueFilter = e => {
+      const msgId = e.returnValues.messageId || e.transactionHash
+      if (used[msgId]) {
+        return false
+      }
+      used[msgId] = true
+      return true
+    }
+    homeToForeignRequests = homeToForeignRequests.filter(onlyFirstUniqueFilter)
+    const dropped = total - homeToForeignRequests.length
+    logger.debug(`Dropped ${dropped}/${total} UserRequestForSignature events with same message id`)
+  }
 
   logger.debug("calling foreignBridge.getPastEvents('RelayedMessage')")
   const homeToForeignConfirmations = (await getPastEvents(foreignBridge, {
diff --git a/oracle-e2e/test/amb.js b/oracle-e2e/test/amb.js
index cecc1f533..5bdde5fde 100644
--- a/oracle-e2e/test/amb.js
+++ b/oracle-e2e/test/amb.js
@@ -140,6 +140,73 @@ describe('arbitrary message bridging', () => {
           const value = await foreignBox.methods.value().call()
           assert(!toBN(value).eq(toBN(newValue)), 'Message should not be relayed by oracle automatically')
         })
+
+        it('should reconfirm message in case of validators change', async () => {
+          const newValue = 15
+
+          const initialValue = await foreignBox.methods.value().call()
+          assert(!toBN(initialValue).eq(toBN(newValue)), 'initial value should be different from new value')
+
+          const signatures = await homeBridge.getPastEvents('SignedForUserRequest', {
+            fromBlock: 0,
+            toBlock: 'latest'
+          })
+
+          const { events } = await homeBox.methods
+            .setValueOnOtherNetworkUsingManualLane(newValue, amb.home, amb.foreignBox)
+            .send()
+            .catch(e => {
+              console.error(e)
+            })
+          const message = homeWeb3.eth.abi.decodeParameter('bytes', events['0'].raw.data)
+
+          await delay(10000)
+
+          await setRequiredSignatures({
+            bridgeContract: homeBridge,
+            web3: homeWeb3,
+            requiredSignatures: 3,
+            options: {
+              from: validator.address,
+              gas: '4000000'
+            }
+          })
+
+          const signatures2 = await homeBridge.getPastEvents('SignedForUserRequest', {
+            fromBlock: 0,
+            toBlock: 'latest'
+          })
+
+          assert(
+            signatures2.length === signatures.length + requiredSignatures,
+            `Incorrect amount of signatures submitted, got ${signatures2.length}, expected ${signatures.length +
+              requiredSignatures}`
+          )
+
+          await homeBridge.methods.requestMessageReconfirm(message).send()
+
+          await delay(10000)
+
+          const signatures3 = await homeBridge.getPastEvents('SignedForUserRequest', {
+            fromBlock: 0,
+            toBlock: 'latest'
+          })
+
+          assert(
+            signatures3.length === signatures.length + 3,
+            `Incorrect amount of signatures submitted, got ${signatures3.length}, expected ${signatures.length + 3}`
+          )
+
+          await setRequiredSignatures({
+            bridgeContract: homeBridge,
+            web3: homeWeb3,
+            requiredSignatures: 2,
+            options: {
+              from: validator.address,
+              gas: '4000000'
+            }
+          })
+        })
       }
 
       it('should confirm but not relay message from manual lane', async () => {