Below I have included a log of what is happening,
22:14:39.429 Dakisbehindyou activates Corrosive Dart.
22:14:39.429 Dakisbehindyou spends 16 energy.
22:14:39.429 Dakisbehindyou's Corrosive Dart adds effect Corrosive Dart to Operations Training Dummy.
22:14:39.430 Dakisbehindyou gains 2 energy.
22:14:39.431 Dakisbehindyou's Poisoned (Tech) critically hits Operations Training Dummy for 1564* internal damage, causing 1564 threat!
22:14:39.431 Dakisbehindyou's Corrosive Dart effect of Poisoned (Tech) fades from Operations Training Dummy.
22:14:39.533 Dakisbehindyou's Corrosive Dart adds effect Poisoned (Tech) to Operations Training Dummy.
22:14:39.534 Dakisbehindyou's Corrosive Dart effect of Corrosive Dart fades from Operations Training Dummy.
22:14:39.634 Dakisbehindyou's Corrosive Dart effect of Poisoned (Tech) fades from Operations Training Dummy.
22:14:39.634 Dakisbehindyou's Corrosive Dart adds effect Weak Corrosive Dart (Tech) to Operations Training Dummy.
22:14:40.936 Dakisbehindyou activates Corrosive Dart.
22:14:40.937 Dakisbehindyou spends 16 energy.
22:14:40.937 Dakisbehindyou's Corrosive Dart adds effect Corrosive Dart to Operations Training Dummy.
22:14:41.029 Dakisbehindyou's Corrosive Dart adds effect Poisoned (Tech) to Operations Training Dummy.
22:14:41.030 Dakisbehindyou's Corrosive Dart effect of Corrosive Dart fades from Operations Training Dummy.
22:14:41.030 Dakisbehindyou gains 2 energy.
22:14:41.030 Dakisbehindyou's Poisoned (Tech) critically hits Operations Training Dummy for 1193* internal damage, causing 1193 threat!
22:14:41.935 Dakisbehindyou activates Adrenaline Probe.
22:14:41.935 Dakisbehindyou gains Adrenaline Probe.
it's seriously like 8 steps for a debuff. Think your developers could reduce that a bit or just make our DoT effects last a bit longer and make them unpurgeable like madness will be in 2.5.
Basically what is happening is the call for removal of the first corrosive dart removes both the old and the new one.