App redirects to localhost:8100/? itself

Hi there, I have a few forms with ngIfs and they appear one after another but if I return to previous form app redirects to the start with ‘?’. It looks more like reloading. And there are no exceptions in console. Basically I have a few forms starting like this:

<form [formGroup]="customer" *ngIf="currentGroup === 1">

And I have button calling onNextClick function which is checking if form is valid and incrementing currentGroup. Next function is also getting some data from server.
Tested on Google Chrome and Android. I use Ionic v2.0.0-beta.37.

Why is it happening? Thanks.