You receive a token from CapMonster Cloud, send it to the site, but the site rejects it. Moreover, sometimes the site can accept a token, for example, in one case out of 10 (the percentage of success in your case may be different).
In this case, the nocache parameter can help you.
How to pass a parameter?
Will be applied to all sent captchas.
In the settings of the software used, add the nocache parameter, through a double underscore, at the very end of the API key: