Cannot trade very small amounts

This bug report describes a problem that occurred and then went away when I was using the system. It was not reproducible and it costs money to attempt this bug, currently I am out of funds on this exchange and will have to wait until testing again.

Expected behavior

The behaviour that I expected is to buy one coin of a cheap currency. I expect an informative and correct error message in the case the trade cannot execute. Also I expect to see the ether price of the coin and the total transaction price displayed.

Actual behavior

The amount in ether of one coin was less than the displayable amount so it appeared as zero on the display.
When I executed the trade it gave me an error that You cannot trade this order because it already traded. Someone else already traded this order and the order book hasn't updated yet., this error was not correct because upon refreshing the order I wanted to trade was in fact available.

How to reproduce

Pick a low priced token and try and buy just one.

Then issue an order for 1 token, the total sum shows as 0

The error displayed is that the order is not available but it is obviously there. After a while the error resolved itself.
It reads You cannot trade this order because it already traded. Someone else already traded this order and the order book hasn't updated yet.

• Browser: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/57.0.2987.98 Safari/537.36
• Operating system: Debian GNU/Linux Sid

Recording Of The Bug