EF Core updating record causes an Id of 0

I'm extremely new to Entity Framework and I have a project I inherited that requires a record to be updated. I have the following code:

foreach(Invoice item in paidInvoices) {
item.Paid = true;
item.PaidTsp = DateTime.Now;

_context.Entry(item).State = EntityState.Modified;
}

_context.SaveChanges();


If I do a SELECT directly in the db to view the contents of the Invoice table, the records are updating correctly.

On another page of the site, though, I have a table of Invoice records and these updated records display but they're missing information. For example, in the below snippit, entry.Hours is just 0 instead of what it should be.

<table class="table table-hover">
<thead>
<tr>
<th>Status</th>
<th>Date</th>
<th>Hours</th>
</tr>
</thead>
<tbody>
<tr *ngIf="searching"><td colspan="9" align="center"><h4>Loading results</h4></td></tr>
<tr *ngIf="!searching && totalCount == 0"><td colspan="9" align="center"><h4>Nothing found</h4></td></tr>
<ng-template ngFor let-entry [ngForOf]="results" let-i="index" *ngIf="!searching">
<tr>
<td (click)="open(entry)" role="button">
<span [ngClass]="getStatusStyle(entry.Status)">{{entry.Status}}</span>
</td>
<td (click)="open(entry)" role="button">{{entry.Date | date: 'MM/dd/yyyy'}}</td>
<td (click)="open(entry)" role="button">{{entry.TotalHours}}</td>
</tr>
</ng-template>
</tbody>
</table>


When I click the records, open(entry) runs:

public open(t: invoice) {
if (t.Id == 0) {
this.InvoiceService.insert(t)
.subscribe((result) => {
this.router.navigate([`/invoice/${result.Id}`]);
});
}
else {
this.router.navigate([`/invoice/${t.Id}`]);
}
}


There must be a 0 being returned for the Id somewhere because when open(entry) runs, a new record is created.

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