I've created a lead "Lead 1" and I've converted it to "Account 1".
I've created "Account 2" and on the Lead section of this account, I've linked "Lead 1".
Now, when I go to "Lead 1" I see it has been converted and that it refers to "Account 1", but if I click on the link to "Account 1", I get to "Account 2".
On "Account 1" the link to "Lead 1" disappeared.
Basically, on "Lead 1" I see the name of the linked Account is "Account 1", but the ID in the link is the one of "Account 2".
Have you ever experienced this?