The jacket yoke and under collar have stretched making the top collar too short, circumference wise, around the jacket. This causes the top collar to rise up. The fix is to shorten the under collar. There is usually a center seam on the under collar but this may be a one piece under collar. If so, you just make a seam where there wasn't one. You may need to take in the center back seam of the jacket. The tailor will know if it's necessary. This makes the top collar longer and everything under the collar shorter and the collar will lie down. Pressing will fix it for 60 seconds and it will return. If the tailor just wants to cut off the under collar that is showing to hide it, don't. Proceed to another tailor.