Verified trials are started the first time you call TA_UseTrial() on the machine with the TA_VERIFIED_TRIAL flag. And TurboActivate gets the trial length from whatever you have it set to at that specific moment. So, on the first computer you had it set to 2. And on the second computer you had it set to 21.
This is all by design.
If you want to extend trials, see here: https://wyday.com/limelm/help/trials/#extensions