Difference between Trainer Ht and Trainer Tm

Summary:

We have been working on customized HCM Skill. But we have encountered a weird behavior of the bot.

Here are the snapshots of the different responses that the customer is facing on Dev and Prod.

In DEV:

In PROD:

As you can see in the snapshot from PROD the customer is getting two different answers for "What is my PTO Balance?" and " What is my PTO Balance" the difference here is "?" the question mark but I have trained the bot with Trainer TM method. Despite of training it with Machine Learning Algorithm I have to go ahead and add all the possible combinations of the query as an utterance to the intent.