SignalR Update Chart not working as expected

Iam using Net Core api and angular, and I have one dashboard here There are some charts. I open this page with two different user. And when I change in database something,from signalr api both changed data and unchanged data are coming like below in console.log. In db I changed 3 to 2 last second element only.

  home.component.ts:2153 -1,1,31.01.2020,-1,2,-1
2 home.component.ts:2153 -1,1,31.01.2020,-1,3,-1
2 home.component.ts:2153 -1,1,31.01.2020,-1,2,-1
  home.component.ts:2153 -1,1,31.01.2020,-1,3,-1
  home.component.ts:2153 -1,1,31.01.2020,-1,2,-1
2 home.component.ts:2153 -1,1,31.01.2020,-1,3,-1
  home.component.ts:2153 -1,1,31.01.2020,-1,2,-1

In core part in controller I call this. It call one method and it returns data

[HttpGet]
[Route("Charts")]
public IActionResult Charts(int refShare, int sicil)
{
    var timerManager = new TimerManeger(() => _hub.Clients.All.SendAsync(refShare.ToString(), new { type = "chart", data= _repo.SharingDashboard(refShare, sicil) }));
    return Ok(new { Message = "Charts Completed" });
}

In angular part

this._hub= new signalR.HubConnectionBuilder().withUrl(Url.url.signalR.getMessages, {
      skipNegotiation: true,
      transport: signalR.HttpTransportType.WebSockets
}).build();
this._hub.start().
    then(()=>console.log("Connection Started")).
    catch(err=>console.log(err));
this._hub.on(this.refShare.toString(),(data)=>{
    this.RealTimeDahboard(data.data)
});
this.startHttpRequest();

When I write console.log in RealTimeDahboard() function above result comes. So my chart is always changing. It happens when I open with two user at the same time. If I open one user, it works normally. What can be the reason ?

Thanks for any help