however, your example shows exactly where the problem is when CB needs to determine the right captcha type.
the reason is that the captcha you highlighted is actual a drupal captcha but that type is highly configurable by system administrators. most admin are using the standard captcha (180x60) but you are able to change the size, add some noise like lines and/or sprinkles, change fonts, file format JPG/PNG, number of letters and which letters are used.
because of this its hard to determine the exact type so you get some overlaps and therefore are hard to seperate from each other.
to get an idea regarding that drupal capthca:
hopefully that doesn't discourage you to improve the captchas but i can tell you for sure that this isn't be done with ease.
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