[bug] keyboard bug when using Pycharm 2017.3.2 under CentOS

The bug is, if after opening a file and I don't type anything, then using up-down-left-right arrows on the keyboard to navigate works well. But after I type anything into the file, whenever I click on those arrow buttons on the keyboard, it constantly inserts their corresponding number on the number panel of the keyboard, with no stop, i.e.  left arrow will print out 44444444... right arrow 666666... and alike for up and down arrow. It's really annoying. My colleague faces the same issue. Can anyone help fix it? Thank you so much.

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