Get data from SQL to ESP32 Webserver

Question

I would like to know what is happening? I want that number is in the sql database shows in box, and Idk what is happening Works fine when I do the print of the payload, always appears the number I want

String httpGETRequest(const char* serverName) {
  HTTPClient http;
  http.begin(serverName);
  int httpCode = http.GET();
  String payload = "";
  if (httpCode > 0) {
    payload = http.getString();
    Serial.println(payload);
  }
  else {
    Serial.print("Error code: ");
    Serial.println(httpCode);
  }
  http.end(); 
  return payload;
}
String processor(const String& var){
  Serial.println(var);
  else if(var == "THRESHOLD"){
    return tempThreshold;
  }
  return String();
}
//temperature and threshold function
String readTemp1() {
  return String(readTemp);
}
String tempThreshold1() {
  return String(tempThreshold);
}
const char* THRESHOLD_INPUT_1 = "threshold_input";
void setup() {
  Serial.begin(115200);
  WiFi.mode(WIFI_STA);
  WiFi.begin(ssid, password);
  Serial.print("Connecting ...");
  while (WiFi.status() != WL_CONNECTED) {
    delay(100);
    Serial.print(".");
  }
  Serial.println("\nConnected to WiFi network with IP Address: ");
  Serial.println(WiFi.localIP());
  dht.begin();
  tempThreshold = httpGETRequest(serverName);
  server.on("/", HTTP_GET, [](AsyncWebServerRequest *request){
    request->send_P(200, "text/html", index_html, processor);
  });
...

Result1:

And if I change the line

tempThreshold = httpGETRequest(serverName);

To this

tempThreshold = "60";

Result2: