I have Factorio 2.042 and LTN 2.0. Using the LTN combinator mod as well. I'm experiencing trains delivering fluids twice on my Pyandons save. I'm not experiencing this with items, it seems. I didn't have this issue before 2.0, fyi, so my thresholds are alright. Any ideas as to why this is happening?

My guess would be that your threshold is below 12500 (half the wagon capacity) and you do not stop filling your tanks when the requested amount is needed. So it dispenses two trains to fulfill.

Could be worth checking if there is atleast one station that does not limit.

Thanks. I have more details. I'm playing Pyanodons. The tanks I'm using are 40kl and 100kl so plenty of room for a 25kl train car to unload. The thresholds where fine before 2.0. I've run this map for a long time and never had an issue till now. Just now, I noticed that the LTN lamp light is green - not blue on the second delivery. Almost like the combinator isn't connected because the light should be blue on an official delivery. Here's a screen shot of an instance of this issue: https://i.imgur.com/ktZL4TF.jpeg

Problem solved! Found the answer on the Github for LTN. Turns out that I had to check the "Requestors ignore stopped trains" box to OFF. This should be off by default, in my opinions as well as the stop time out should be zero by default. Both of these setting cause nothing but problems if a new user has no idea what they are. Here are the setting for anyone else that pops along here: https://i.imgur.com/awaUcau.png

Problem solved! Found the answer on the Github for LTN. Turns out that I had to check the "Requestors ignore stopped trains" box to OFF. This should be off by default, in my opinions as well as the stop time out should be zero by default. Both of these setting cause nothing but problems if a new user has no idea what they are. Here are the setting for anyone else that pops along here: https://i.imgur.com/awaUcau.png

Thank you for this, I had the exact same issue. Was checking my signals over and over again, thinking I forgot how LTN works or something.
Weird that this setting is enabled by default.

Edit: aw shoot, turns out my problem still persists, even with the setting.

Many thanks, I've been experiencing this for a long time and finally got fed up enough to google it!

I changed the default setting back in 2.4.0 This should reduce the confusion.