Mapping control+j not working

Hey I have this mapping for easy navigation on windows
map <C-h> <C-w>h map <C-j> <C-w>j map <C-k> <C-w>k map <C-l> <C-w>l
and control+h, control+k, control+l works fine and smooth. But when I press control+j instead of moving the bottom windows it goes to insert mode. If I press control+w then j it works correctly.
Could you provide some advices?
Thanks.

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