[O] closing *org-agenda* pops up emacs *calander* buffer?

[Xebar Saram]

Hi all

Weird issue. each time i close the *org-agenda* view (using q) i always get a window with what seems the default emacs calendar (the *calendar* buffer). I want to go back to the previous buffer i visited before launching org-agenda. 

I cant understand whats causing this. any clues?

this is the buffer that always pops up

https://paste.xinu.at/b9O0/

best 

Z