UserAgent: Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/59.0.3071.104 Safari/537.36

Example URL:
https://www.wabatam.com/testone, https://www.wabatam.com/testtwo 

Steps to reproduce the problem:
1. open first tab, url https://www.wabatam.com/testone
2. open second tab, url https://www.wabatam.com/testtwo , then hit submit
3. goto first tab, hit submit, 

What is the expected behavior?
on first tab, it should redirect to https://www.wabatam.com/testone 

What went wrong?
it redirect to different url (same domain) https://www.wabatam.com/testtwo 

Does it occur on multiple sites: N/A

Is it a problem with a plugin? N/A 

Did this work before? Yes 57

Does this work in other browsers? Yes

Chrome version: 59.0.3071.104  Channel: stable
OS Version: 6.1 (Windows 7, Windows Server 2008 R2)
Flash Version: 

Here is custom link for test : 
1.open first tab  :
https://www.wabatam.com/testone

2.open second tab : 
https://www.wabatam.com/testtwo , press submit

3.goto first tab : 
press 'submit'

I found out, you don't need to submit on second tab, you can just go back to first tab, and click submit, it will redirect to https://www.wabatam.com/testtwo.

my server (laravel)'s simple code : 
Route::get('testone',function(){
        return "<h3>First Tab</h3><form method='post' action='testonepost'><input type='hidden' name='_token' value=".csrf_token()."><input type='submit'></form>";
});

Route::post('testonepost',function(){
        return redirect()->back();
});

Route::get('testtwo',function(){
        return "<h3>Second Tab</h3><form method='post' action='testtwopost'><input type='hidden' name='_token' value=".csrf_token()."><input type='submit'></form>";
});

Route::post('testtwopost',function(){
        return redirect()->back();
});