You are using SFML 2.3.2 procompiled libraries from the sfml website, right?
Then I have no more ideas on why it wouldn't work for you.
You could still try to remove everything of tgui from your pc (including the dlls in your project if you are linking dynamically), download the source code and build it yourself with cmake.
The only other thing you could do is start using v0.7-dev which is so different that the same issue can't happen. But that means that you have to rewrite the code that you already have.
Then I have no more ideas on why it wouldn't work for you.
You could still try to remove everything of tgui from your pc (including the dlls in your project if you are linking dynamically), download the source code and build it yourself with cmake.
The only other thing you could do is start using v0.7-dev which is so different that the same issue can't happen. But that means that you have to rewrite the code that you already have.