Don't worry too much about it... First, my Glock 17 had 2 FTEs when I first took it out. There's a reason its called a break in period. I promise after a clean and a lube you won't have that issue. Put another 100 rounds in it or so and if you still have problems then you should worry.
A small thing is also that Winchester white box tho its the ammo I use isn't my favorite for breaking in a pistol. Federal might do you better or the more expensive Remington rounds.