Your saying you physically broke the bolts in 1/2? (steel bolts broken off in an aluminum part with 25 ft./lbs. of pressure?) Or did you strip the threads on them? In either case, are you sure you didn't look at the wrong guage on the Torque Wrench and go to 25 N-M (Newton Meters) instead? Newton Meters are roughly 1/2 again more pressure than Foot Pounds of an equal amount (example: 1 N-M vs. 1 Ft. lb.). I also wonder if you didn't strip the aluminum part out? (it was aluminum correct?)
I need more info before I speculate on a cause. Were you working with ALL of the original equipment that came on the bike originally or were you dealing with some or all aftermarket parts? Also was this just reassembling what was already on the bike or were you replacing/upgrading ANY parts? Aftermarket parts can have different torque specs than stock, also with the influx of China made immitation crap you have to be careful of what your buying nowdays (example: if you had just changed banjo bolts). In the past I saw some knock-off aluminum banjo bolts, were the banjo bolts that broke made of steel? If they were aluminum their toque spec would have been much lower.