I haven't experienced that with triz. It seems odd because I'd expect the slower stomach emptying to let food break down more, not less, with the added time. What dosage are you using?
It could be from changing my diet since I'm having more vegetables and salads now, but it's strange seeing undigested leaves and carrot pieces in my stool. Especially around two days after taking a dose. The side effects from triz seem to kick in about 48 hours later for some reason.