Hello, thank you for getting in touch and for your support!
Since you've disabled culling on a transparent surface, you'll have to make use of the
Switch by Face and / or
Face nodes, depending on the effect you wish to create, in order to provide data to the shader on how it should behave in regards to both front and back faces of the surface, since they are currently being rendered at the same time.
Please let me know if this information helps, thanks!