For what I understand CK gets info from the credit bureau's monthly. I paid off 2 credits cards in full last month and it is still not showing on CK, my due dates are around the 18th for this month and the report usally comes in on the 29th day.
Sometimes, the info on CK isn't correct and iffy at best. To verify items have been deleted, pull your report directly from TU.
CK has always been quite quick IMO to have updated information whether it be baddie deletions, updated balances, etc.
I use wallethub for TU. They give you daily updates, though they seem to be a day behind. It's the same score (vantage) as CK but if you're looking for free ways to keep tabs on it, go to wallethub.
Credit karma updates reports every 7 days, so if TU sent their report today, but CK had updated their report yesterday, it would take another 6 days for CK to reflect the new information in the TU report, but the snail would likely get to you in 3 days.
IMO differrent timing cycles explains a lot of confustion about what is happening with credit reports and scores.