Artifactory is magicing up checksums for things which are not even valid
INFRA-2914 for an example.
validate that all proxy settings are set to either ignore the cehcksum (if you do not care or are consuming garbage), or fail (to prevent pollution).
but please ensure you never set it to "Ignore and generate" so that others repositories are not corrupted with the same garbage.
see https://www.jfrog.com/confluence/display/JFROG/Remote+Repositories#RemoteRepositories-Maven,Gradle,IvyandSBTRepositories for the configuration details