Sometimes the reason can be that you tried to exclude parameters that are actually not parameters, or the crawler does not identify them as such. Characters cannot be excluded as parameters.
For example, a question mark is not seen as a parameter by the crawler. For "?example_parameter=1111", "example_parameter" is a parameter, but "?" is not.
However, corresponding URLs can be easily excluded by placing the question mark in the "Exclude URLs" field, then all URLs with this character will be ignored. You can exclude URLs in the crawl set up in the advanced settings.