Login page with [woocommerce_my_account] shortcode is not displayed correctly both on desktop and mobile devices.

Hi.
I have tested a trail theme “urja-solar-energy”. But now I have payed for the PRO version of the same theme. So far so good.
Then I uploaded the new theme urja-solar-energy-pro.zip the right way.
1. Log in to the WordPress Administration Screens.
2. Select the Appearance screen, then Themes.
3. Select Add New.
4. Either use the Search or Filter options to locate a Theme you would like to use.
5. Click on the Preview link to preview the Theme or the Install link to upload the Theme to your site,
6. Or use the Upload Theme button at the top of page to upload a zipped copy of a Theme that you have previously downloaded to your machine.

But the problem is that the newly activated theme is still getting all the old changes I did do on the trail version.
Have deleted the old theme, but no change.

So these changes I don′t get deleted of must be located in files outside the “theme” folder, witch files must I delete or replace so I can get a complete new fresh theme in place?
Best regads
Johan