I assumed the Glock 26 and Glock 22 were similar in the recoil spring assembly (pages 15-16,and 18 in the Glock handgun manual, parts 3&4...however, the manual says part 23, the recoil spring assembly, is not interchangeable between the Glock 22 and the Glock 26, see page 17 listing in the manual)when assembling the pistol after cleaning, with the Glock 22, the recoil spring assembly MUST be assembled with the smaller bead-head forward toward the muzzle and into the spring-coil assembly hole, the lower one, otherwise, the rear button gets clipped and broken when the slide comes forward. That apparently is NOT the case with the Glock 26. Sorry about the confusion. I would however, look to make sure that the rear button on the recoil assembly is seated/bottomed properly, because it sounds like a failure to seat it all the way against barrel might result in the same breakage as with the Glock 22.
RugerCal480 (Mike)