How did two revisions get deployed in one environment?

[#1]

We've been using Apigee's APIs to deploy our proxies and have been running into issues where two revisions are deployed on the same org/environment. Does anyone have an idea of what's going on? This is a sample request to deploy:

https://api.enterprise.apigee.com/v1/organizations/my-org/environments/test/apis/my-proxy/revisions/...