Purchase down issue about cote-workshop HOT 3 OPEN

I had a similar problem where if you click the buy button really fast, it does the same thing.

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If you download and run up the docker-compose you will see that the system work fine!

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Downloaded cote-workshop-master.zip
Unzip to folder.
Go inside folder, and "docker-compose up", waiting everything ready...
Browse to http://localhost:5000, http://localhost:5001 and http://localhist:5555.

Success to add item in http://localhost:5000.
Success to buy in http://localhost:5001, but it was strange because i clicked very fast successively. In the screenshot:

• clicked 10 times
• balance shown correctly (down 10 from $30 to $20)
• purchases shown 11 purchases (should be 10 purchases)
• Stock decreased 5 from 1000 to 995 (stock should be 990)
  

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