Can you gain weight on whole grain bread even if it is within your allowed calories?

I went through a phase of eating about a loaf a day of aunt millie's whole grain bread:

http://www.auntmillies.com/#goto_productsBrea dHealthygoodness

During this time i was within my 1800 calorie limit and exercised 3 times a week. I was having 8 slices of bread (35 cals/slice) with 90 calories of sugar free syrup (with sorbitol). Also in between class and work i would add garlic salt to the bread and have some garlic bread :) During this time even though i was eating the right count of calories i slowly gained weight (like half a pound a week) instead of losing a pound a week. The ingrediants state it is whole wheat gain and its not refined so im at a loss. Could anyone explain? Also, the bread has a boatload of fiber, lotsa protein, and is reliatavely low on carbs because of the high protein. The bread is on sale again and im thinking of whether i want to stock up or not.

[edit]

Oh and i went from a 30.5 inch waistline to 33.5 during this almost month long bread streak.

I think bread could have a lot of sodium in it, so it could be water weight.  Salt can increase weight and also make clothes fit tighter if you are bloated from it. Bread alone really shouldnt cause weight gain, unless you are simply eating too many calories from it.

Also, part of your weight gain could be from muscle, and not fat.

The problem with eating an unbalanced diet like that is that you never know how it's going to affect your body.  Are you eating any protein, vegetables, fruits, dairy products, or fats? 

As richmondbread said, it could be the sodium causing water weight gain.  Or it could be an actual weight gain caused by an inaccurate calorie count. 

Ahhh sodium... i never thought to look at that aspect. That would make sense if it were water weight because about 4 days after i cut the bread my weight and waistline went back down and i didnt work out that much, only like 4 miles of running/jogging. According to the nutrition facts it has 8% per 2 slices and if i ate at least 16 slices a day thats 64% of my sodium. Then add in the diet pop i was drinking and the salt from the garlic and the sodium in the syrup... that was probably what did it. The bread is pretty balanced as far as protein and it does have some good fats. I probably will just stock up and not only eat bread and throw it in the freezer...