Zend certified PHP/Magento developer

Module stops working after enabling another module

So i have a problem with 2 shipping related modules that send data to third party after order has been made.
The modules have almost the same code but they have their own namespaces and diffrent api URL POST requests.

Lets say they are module A and module B. When enabling module A and module B is disabled, module A works fine, but when enabling module B, module A API POST requests wont work anymore and module B works fine.

I used magefan conflict detector and it didnt show any conflicts, so if anyone has any ideas please share them.