Paying off your debt when it's in collections is a good thing and can help to restore and improve your credit rating.
But paying off your debt when it's in collections doesn't automatically mean it will be reported to the credit bureaus.
Most times the paid off collections will still remain on your credit report for 7 years even if it's been paid unless you contact a credit repair agency and have them help you get the paid off collection removed and reported on your credit rating.