There is a known issue with the numpad comma on Google Chrome.

[mconf-daileon]

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Author Name: Rafael Petersen (Rafael Petersen) Original Redmine Issue: 1968, http://dev.mconf.org/redmine/issues/1968 Original Date: 2016-04-19

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There is a known issue where typing a comma from the numeric keypad will add a new line (keyCode=13) on any textArea if the user is on a Google Chrome browser.

We have tryed a few workaround solutions for this behaviour which weren't functional or of good enough for the client:

• Supressing the key event using preventDefault() did'nt work as it is not cancellable;
• Replacing the input by deleting the new line (CR) was not satisfactory as it was very easy to notice the insertion and deletion happening on the client;
• Undoing the input by saving the text on keydown, editing it to add the comma and then replacing the text with the corrected verion on keyup was also noticeable to the user (http://stackoverflow.com/posts/4399011/revisions);
• Restricting this keycode input doesn't work at all.

As for today we could not find a viable solution or reportis of this issue from other users.