see if you have the correct timings set everywhere in your files. And be sure that the standard timing hasn't been changed.
if the retry interval is 5 and the interval is defined as 5 minutes you will get 25 minutes interval... but it defaults to 1 minute...
If you check you scheduling queue are they scheduled at 5 mintues interval? You cn check this in the service properties too. find last check time and next shceduled check time.