RASA core handling simultaneous requests

Hi, I created a RASA bot but it is unable to respond to multi user/simultaneous requests on slack. It queues up the requests for users and only processes new requests once the 1st user’s chat request is complete. I am using rasa core 0.12.3 and rasa nlu 0.13.8

Code used to run the bot: python -m rasa_core.run -d ./models/dialogue -u ./models/nlu/default/current --port 5005 --endpoints ./domain/endpoints.yml --credentials ./config/credentials.yml