It seems like you're debugging a MultiThreaded app, which is accessing the same method multiple times, as i said in the comments.
Check your Threads
window and you will see that more then 1 Thread is accessing the called method, and that's why you're experiencing having to press F10 more then once, and why F11 is returning back to the called method.
Inside your Threads
window, you can Freeze threads by right clicking them and pressing "Freeze".