It seems like the issue could be related to how Realm processes changes and notifies observers, particularly in offline scenarios. Here are a few steps to help diagnose and potentially resolve the issue:

1. Check for write transaction completion: Ensure that any changes to Realm are committed within a write transaction before trying to observe them. Example:

   try! realm.write {
       realm.add(object)
   }
   

   Without this, observers may not receive updates immediately.

2. Verify RxRealm setup: RxRealm observers should respond to Realm's notifications. For example:

   Observable.collection(from: realm.objects(MyObject.self))
       .subscribe(onNext: { results in
           print("Updated results: \(results)")
       })
       .disposed(by: disposeBag)
   

   Ensure you're observing the correct collection or query.

3. Check Realm configuration: Confirm that your Realm configuration is set up correctly. For example, if you’re using synchronization, delays might occur if the Realm file isn’t fully available offline. Consider disabling synchronization in the offline mode if not needed:

   var config = Realm.Configuration()
   config.syncConfiguration = nil // For offline-only use
   Realm.Configuration.defaultConfiguration = config
   

4. Investigate thread usage: If you're working with Realm on multiple threads, ensure that you're using Realm instances and objects properly across threads. Realm objects are thread-confined, so you'll need to fetch them again in the new thread context.

5. Logging and debugging: Enable Realm's debug logs to gather more insights:

   Realm.Configuration.defaultConfiguration = Realm.Configuration(schemaVersion: 1, migrationBlock: { migration, oldSchemaVersion in
       // Handle migrations
   }, shouldCompactOnLaunch: { totalBytes, usedBytes in
       return true
   })
   
   Realm.Configuration.defaultConfiguration.shouldLogErrors = true
   

6. Check Rx updates: RxRealm relies on Realm’s notification system, which might have a delay in some scenarios. Try using Realm.observe() directly to rule out RxRealm as the source of the delay.

If the issue persists, please share a code snippet that reproduces the problem, so others can provide more specific guidance. Also, let us know if this behavior occurs only in offline mode or also when connected to a network.