Hi there, thank for you for this information. I bought my Tissot Chronograph over a year ago and always thought there was something wrong with it, I never managed to get back to the shop to ask.You can zero each of the hands on the chronograph dials individually. Here's how:
1) Make sure the chronograph is stopped.
2) Reset the chronograph with the pusher at 4 o'clock. If any of the hands aren't at their "zero" position they'll need to be adjusted.
3) Pull out the winding crown to the first position (date setting position).
4) Push the plunger at the 2 o'clock position. This will advance one of the chrono hands a step at a time. Stop it when the hand is at zero.
5) Push the plunger at the 4 o'clock position. This will adjust another of the chrono dials.
6) Pull the crown out to the second position (time setting position) and use the 2 or 4 o'clock plunger to adjust the final chrono dial.
One of the 4 possible crown/plunger combinations doesn't adjust anything. I don't have a chrono with me at the moment so I'm not sure which crown/plunger combination is the non-functional one. Anyhow, I hope this helps.
I've just found this post and the information you have provided has fixed everything. Thank you very much.