WOW I just had my first lower attenuated batch then normal

All of my batches over the last year have all been 1.010 or less regardless of the yeast i used. I brewed my dipa and decided to add .25 honey malt and use ringwood on it instead of 1056. both of these yeast have never gone higher then 1.010. this one finished at 1.018 after 3 weeks in the primary at 64 which is 3 points higher than what beersmith said it would be. i got to tell ya it's definitely got some sweetness to it. below is the recipe and yes i used a 2 step 1 qt starter on it which took off like a mad man.

Type: All Grain Date: 10/12/2012
Batch Size (fermenter): 6.00 gal Brewer:
Boil Size: 8.00 gal Asst Brewer:
Boil Time: 60 min Equipment: Double ipa set up
End of Boil Volume 7.00 gal Brewhouse Efficiency: 65.00 %
Final Bottling Volume: 5.50 gal Est Mash Efficiency 74.6 %
Fermentation: winter profile Taste Rating(out of 50): 30.0
Taste Notes:
Ingredients


Ingredients
Amt Name Type # %/IBU
13 lbs Pale Malt (2-Row) Canadian Malting Co (2.0 SRM) Grain 1 73.2 %
1 lbs Munich (Cargill) (9.5 SRM) Grain 2 5.6 %
1 lbs Victory Malt (25.0 SRM) Grain 3 5.6 %
1 lbs Wheat malt - (Briess) (2.3 SRM) Grain 4 5.6 %
4.0 oz Honey Malt (25.0 SRM) Grain 5 1.4 %
1 lbs 8.0 oz Corn Sugar (Dextrose) (0.0 SRM) Sugar 6 8.5 %
0.50 oz Horizon [11.10 %] - Boil 60.0 min Hop 7 13.7 IBUs
2.00 tsp Gypsum (Calcium Sulfate) (Boil 60.0 mins) Water Agent 8 -
1.00 tsp Epsom Salt (MgSO4) (Boil 60.0 mins) Water Agent 9 -
1.00 oz Cascade pellet [6.70 %] - Boil 30.0 min Hop 10 12.7 IBUs
1.00 Items Whirlfloc Tablet (Boil 15.0 mins) Fining 11 -
3.00 oz Cascade pellet [6.70 %] - Boil 15.0 min Hop 12 24.6 IBUs
3.00 oz Citra pellet 3 [14.10 %] - Boil 10.0 min Hop 13 37.8 IBUs
3.00 oz Amarillo Leaf [9.50 %] - Boil 5.0 min Hop 14 12.7 IBUs
2.00 oz Amarillo Leaf [9.50 %] - Aroma Steep 15.0 min Hop 15 0.0 IBUs
2.00 oz Cascade pellet [6.20 %] - Aroma Steep 15.0 min Hop 16 0.0 IBUs
2.00 oz Citra pellet 3 [14.10 %] - Aroma Steep 15.0 min Hop 17 0.0 IBUs
1.0 pkg Ringwood Ale (Wyeast Labs #1187) [124.21 ml] Yeast 18 -
1.00 oz Amarillo Leaf [9.50 %] - Dry Hop 7.0 Days Hop 19 0.0 IBUs
1.00 oz Cascade pellet [6.20 %] - Dry Hop 7.0 Days Hop 20 0.0 IBUs
1.00 oz Citra pellet 3 [14.10 %] - Dry Hop 7.0 Days Hop 21 0.0 IBUs

Beer Profile

Est Original Gravity: 1.076 SG Measured Original Gravity: 1.072 SG
Est Final Gravity: 1.015 SG Measured Final Gravity: 1.012 SG
Estimated Alcohol by Vol: 8.1 % Actual Alcohol by Vol: 7.9 %
Bitterness: 101.6 IBUs Calories: 243.1 kcal/12oz
Est Color: 7.4 SRM
Mash Profile

Mash Name: Single Infusion, Medium Body, Batch Sparge Total Grain Weight: 17 lbs 12.0 oz
Sparge Water: 4.97 gal Grain Temperature: 72.0 F
Sparge Temperature: 170.0 F Tun Temperature: 72.0 F
Adjust Temp for Equipment: TRUE Mash PH: 5.20

Mash Steps
Name Description Step Temperature Step Time
Mash In Add 6.09 gal of water at 165.2 F 152.0 F 60 min

Sparge Step: Batch sparge with 2 steps (Drain mash tun, , 4.97gal) of 170.0 F water
Mash Notes: Simple single infusion mash for use with most modern well modified grains (about 95% of the time

Three points isn't much of a difference...I doubt it woudl highly impact flavor. DIPAs tend to be a little sweet, like most big beers.