Segment confirmed, added to TM, then edited, and reconfirmed but DOUBLES are made instead of being overwritten

Question

Hello, 
 One of my team members has been experiencing this problem which I've never seen before and honestly thought was impossible. I can't replicate this phenomenon on my own computer so I don't know which settings were changed on her computer to result in this. 
 
 To test the problem she told me about, I typed "(In parenthesis, the LCD display is explained.) the the" and confirmed the segment and it entered the TM. Then I immediately deleted "the the" and confirmed the segment but instead of overwriting the segment and showing a CM/100 match, it shows both most recently confirmed hits with a -1 duplicate penalty. I thought such penalties would only apply to duplicates from different TMs. But this is the same TM and same project so I'm very lost as I thought this went against the very core of Trados's code. Please assist.

Paul Filkin · Accepted Answer

Keenan Cooper 
 
I wonder if it's related to the use of Lookahead? Perhaps the original result is still cached and causes you this problem when you change it immediately. 
 
Try turning off Lookahead and see if this still happens. You might have to close the file and open again after changing the setting, just to be sure. I'm not sure when Studio holds onto some settings and when not so worth making sure.

Paul Filkin · Answer

Keenan Cooper 
 
I think I'd like to know if this was the problem before I respond to you.

Nora Díaz · Answer

Keenan Cooper said: 
 I thought such penalties would only apply to duplicates from different TMs. 
 
 Hi Keenan, 
 I just wanted to chime in and say this also happens when you manually add multiple translations to a TM, but that's, of course, intentional. 
 However, if I'm understanding correctly, your colleague is not using the Add new translation option, but rather is confirming her segments as usual. 
 I was trying to see if I could repro this, as I hadn't necessarily noticed it happening, and I can report that I've been able to reproduce it. 
 Here's a video showing the issue as I'm seeing it. It doesn't happen all the time, and it doesn't necessarily happen on the same segments, that is, if you go back to the same segment and change its translation multiple times, sometimes the TU will be overwritten and sometimes it won't. LookAhead is disabled, but that doesn't seem to make a difference. I also tried with my main TM and with a new, empty one, and the issue happened with both. 
 
 Paul Filkin are you able to reproduce this as well?

Paul Filkin · Answer

Hi Keenan Cooper , Nora Díaz 
 
Thanks for your feedback here. I spent some time this morning trying to reproduce this and eventually I did. I still don't know how to do this on purpose every time, but I somehow managed to get duplicates in a new TM with lookahead enabled. 
 
I have brought this to the attention of the product owners for Studio so they can add this to the detail they are collecting for development.

Trados Studio > 1. Trados Studio

Segment confirmed, added to TM, then edited, and reconfirmed but DOUBLES are made instead of being overwritten