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Running 2 development servers in a Kubernetes pod using Flask may cause the following issues:

1. Resource contention: Running multiple development servers in a single pod may lead to resource contention as they may compete for CPU, memory and network resources.

2. Port conflicts: Each development server must use a unique port for communication. Running multiple servers in a single pod may lead to port conflicts and make it difficult to ensure stable and reliable communication.

3. Increased complexity: Running multiple development servers in a single pod increases the complexity of the deployment. This may lead to a more complex configuration which may be difficult to maintain and scale.

4. Reduced scalability: Flask is designed to operate in a single process mode, which can limit scalability when running multiple servers in a single pod.

5. Limited fault isolation: Running multiple development servers in a single pod limits the ability to isolate failures. If one server fails, it may cause the entire pod to fail, which may impact other services running in the pod.