The CAPTCHA "text" isn't really text. It's an image. The "gaming" computer would therefore fail in 'reading' the presented image whereas a person could. Of course, computers can be programmed to 'read' the image so, colors are added to confuse machine reading but not human reading.
The "gaming" computer can try any number of times, but if it can't recognize and translate images to test, it will always fail.
In actuality, I think this is a malfunction of the CAPTCHA text... you might drop Bara a PM about it.