Mortgage rates moved lower every week for the past 3 weeks.  They covered a respectable amount of ground during that time and ultimately erased most of September's damage by Friday afternoon. 

In outright terms, September's weakness pushed the average 30yr fixed rate quote roughly 3/8ths of a percentage point (.375%) higher.  The past 3 weeks have helped to claw back roughly 0.25% of that.  

Because of that relatively decent and relatively sustained winning streak, there's a risk that rates will hesitate to make any further improvements this week.  Today's modest weakness serves as a softly-worded warning to that effect, but we'd need to see several more days of higher rates in order to confirm that sort of upward momentum.  As of today, it's a risk to keep an eye on.