I'm experiencing the following difference of the Lightning behaviour between two environments. In one of the environments when I edit a Lead record it pops up the edit page and its title is 'Edit Lead'. In the other environment on edit the page title is 'Edit {Last Name}' e.g. 'Edit Smith'.

If any of you noticed such behaviour. Could this be related with the date of the environments creation or the edition of the environments.

I want to stick with Salesforce Lightning but cannot understand where these differences come from and which is the correct behaviour.

**EDIT**

I observe the standard Salesforce Lightning behavior when I override the standard 'new' and 'edit' pages with my VF pages. Doing this I do not use any custom pages or modifications. I need the standard Lightning behavior. I'm testing Lightning using two different orgs with sys admin user (desktop pc). One of the orgs is professional edition and the other one is developer edition.

What I noticed is that in the professional edition on edit the page title is 'Edit {Last Name}' and in the developer edition the page title is 'Edit Lead'.

My question is why there is difference between the orgs. How to determine where this kind of differences could be observed. Would this be unified in the future.