Hi JohanAu,
I haven't been able to reproduce the Lot Amount issue you mentioned.
Can you please reproduce the issue and send me the BittrexPlugin.log (clear the keys)?
Need to check the API call parameters

From a quick test I did looks fine

Line 118: 2017-11-21 08:33:30,755 INFO [default] BrokerBuy IN
Line 119: 2017-11-21 08:33:30,756 INFO [default] BrokerBuy Params: BTC-XLM Amount:212 StopDist:0.00000000
Line 129: 2017-11-21 08:33:37,216 INFO [default] BrokerBuy OUT
Line 1183: 2017-11-21 08:38:05,609 INFO [default] BrokerBuy IN
Line 1184: 2017-11-21 08:38:05,609 INFO [default] BrokerBuy Params: BTC-XLM Amount:-212 StopDist:-1.00000000
Line 1194: 2017-11-21 08:38:08,651 INFO [default] BrokerBuy OUT