weird behaviour of numpad when using pycharm via remote desktop

hi

im connecting from my windows 10 to ubuntu 16.04 via remote desktop.

when im typing the num keys from the numpad, some of them respond incorrectly, like someone configured them to be a hotkey:

when numlock is on:

0 - deletes the whole line

. - copies it back

1 or 3 - shift+end

7 or 9 - shift+home 

the rest of the numbers respond correctly.

when numlock is off:

2,4,6,8 do nothing

0,.,1,3,7,9 function as expected (home,end,etc.)

when outside of pycharm (eg terminal, gedit, etc) everything responds as expected.

also, when connecting through ssh (eg. mobaXterm) this problem do not occur.

any ideas as for how to solve this issue?

thanks

kfir