Episodes 11 and 12 aired back-to-back on the same day (parts 1 and 2 of "Siege Protocol"). On my old-style cable box, they are combined into a single entity labeled "SEAL Team 02-26". It's twice as long as the others, if you check the lengths.
No guarantees about X1, but I suspect you'll find them combined there as well. (Check the episode length of episode 11.)