Trados Alignment for 2017 - why is it well-aligned in 1 machine and poorly-aligned in another?

Hi all,

We have Trados 2017 installed on separate laptops. Both installations have different SR1 versions, and we are trying to align the same English and Traditional Chinese document pair (Align Single File-pair). 

The following is the output of Trados 2017 SR1 14.1.10017.54688:

The following is the output using Trados 2017 SR1 14.1.10018.54792: 

The first result is very, very clean, with only very few segment reconnects required. The second one is a very poor result, requiring us to take significantly more time to clean up (using Google Translate to help, etc ....). Interestingly, the segmentation in the source and target languages is the same as you can see, it is just that alignment's guessing logic is showing very different results? 

I'm wondering if anyone knows whats going on here? We applied the latest update to the second laptop but didnt expect alignment to behave weirdly. We also have not used alignment on the said machine before the update to 14.1.10018.54792, so we can't tell if it has to do with the Trados installation or something else.

Appreciate if anyone can share a similar experience and the solution please? Thanks in advance!!