is there a way to force stop a flow run ?

Killing the process directly (removing the pod, killing the container) is the easiest and the most reliable Hard to do in a hybrid model

if i delete the flow run from ui, will that cause problems? i think it created lot of pods with error flow run not found

try checking your setup, your PREFECT_API_URL or PREFECT_API_KEY might be invalid if you get 404

no no , im able to trigger deployment runs via cli.. so login creds are correct