Duplicate keys in overrides map

On push, Datomic reports some deps twice:

{com.cognitect/transit-java              #:mvn{:version "0.8.337"},
 org.clojure/data.json                   #:mvn{:version "0.2.6"},
 org.clojure/clojure                     #:mvn{:version "1.10.1"},
 commons-codec/commons-codec             #:mvn{:version "1.13"},
 org.clojure/core.specs.alpha            #:mvn{:version "0.2.44"},
 org.clojure/spec.alpha                  #:mvn{:version "0.2.176"},
 org.eclipse.jetty/jetty-http            #:mvn{:version "9.4.27.v20200227"},
 org.eclipse.jetty/jetty-util            #:mvn{:version "9.4.27.v20200227"},
 com.fasterxml.jackson.core/jackson-core #:mvn{:version "2.10.1"},
 com.cognitect/http-client               #:mvn{:version "0.1.105"},
 com.cognitect/transit-clj               #:mvn{:version "0.8.319"},
 org.eclipse.jetty/jetty-client          #:mvn{:version "9.4.27.v20200227"},
 org.eclipse.jetty/jetty-io              #:mvn{:version "9.4.27.v20200227"},
 org.clojure/tools.reader                #:mvn{:version "1.3.2"},
 org.slf4j/slf4j-api                     #:mvn{:version "1.7.14"},
 org.clojure/test.check                  #:mvn{:version "0.10.0"},
 org.clojure/core.async                  #:mvn{:version "1.3.610"}}