Deleted cell appears at the end of tableView list - swift

Question

I have a request that update array (append there a new instance if it exist) of new incoming message
#objc
private func loadNewThread() {
func refreshThreads(newThreads: [ThreadModel]) {
var oldThreads: [ThreadModel] = self.threads
var updatedThreads: [ThreadModel] = []
for new in newThreads {
updatedThreads.append(new)
if let index = oldThreads.firstIndex(where: { $0.threadId == new.threadId }) {
oldThreads.remove(at: index)
}
}
updatedThreads.append(contentsOf: oldThreads)
self.threads = updatedThreads
DispatchQueue.main.async {
self.updateEmptyState()
self.tableView.reloadData()
}
}
messageService.getThreads(searchText: searchBar.text?.lowercased(), page: 0) { (result) in
switch result {
case .value(let newThreads):
refreshThreads(newThreads: newThreads)
case .error(let errors):
self.handleErrors(errors: errors)
}
}
}
I update it in viewDidLoad by Timer every 5 sec
override func viewDidLoad() {
super.viewDidLoad()
Timer.scheduledTimer(withTimeInterval: 5.0, repeats: true, block: { [weak self] (timer) in
guard let self = self else {
timer.invalidate()
return
}
self.loadNewThread()
})
}
I am removing element from array and row respectively by element index
if let index = self.threads.firstIndex(where: { $0.threadId == thread.threadId }) {
let cellIndex = self.threads.firstIndex(where: { $0.threadId == thread.threadId })
self.threads.remove(at: index)
if let cellIndex = cellIndex {
self.tableView.beginUpdates()
self.tableView.deleteRows(at: [IndexPath.init(row: cellIndex, section: 0)], with: .automatic)
self.tableView.endUpdates()
self.animateLayout()
}
But after deleting, the deleted cell appears at the end of the tableView list.
I suppose that the request to delete element fulfills after the request to append to the array
How should I make my cell disappear?