Wow, it took a mess of two conflating bugs to cause this.
That line should (and when fixed, will) say:
Hits have 200(140-200)% increased Critical Strike Chance against you
The stat already functions this way, the issue is purely with the display.
What it's actually trying to display isn't 20010, but 200, followed by 10, due to the bug it's outputing the values twice, with a multiplication factor on one of them.