If you are finding lab caches as part of a streak or lab cache dot days or any other situation where is is crucial that the lab cache be found on a specific date, ensure you log it after half past midnight PST (UTC-8) (Between midnight and half past midnight PST it gets posted one day in the future!!)
I am in New Zealand, for me that is after 8pm. I play save and log after 8:30pm.
I have heard that there are some aplication updates coming, and this problem has been posted on the geocaching forums a number of times. Hopefully they will be fixing it.