Can't login from hikashop checkout page

-- HikaShop version -- : 2.6.1
-- Joomla version -- : 3.4.8
-- PHP version -- : 5.5
-- Browser(s) name and version -- : Firefox 45.0.1

Hello.

I can't log in from the checkout module.
If I log in using my website module (CB), everything is ok.
I access to the next step :
page : /checkout.
message : select an address.
But if I try to log in using the hikashop login module, it doesn't work :
page : /checkout/task-step/step-1
error message : Thanks to login or register to see or modify your profile.

Does anyone know how to fix this issue ?

Thanks in advance

plastic1st

Hi Nicolas.

Thanks for your answer.
The problem seems to come from the fact that I had included a CB Login module instead of the Hikashop Login (just for CSS reasons).
And when the problem occured, I have removed the login_form.php modification, have cleared Firefox cache, but... I have forgotten to clear the Joomla cache.
That's why I also had the problem, back to the Hikashop original configuration.

I've now cleared both Joomla & Firefox caches, and the login works...