[Specjalized]

Hi everyone, I have a volvo s60 D3 second half of 2015, I was exchanging gear leaver and after putting everything back together I checked if all the gears working properly in case I done something wrong, car was parked and I noticed that 5th gear doesn't go in, 6th none existent, from 1th all the way to 4th all good, reverse worked as well. I took it for a test drive and during driving all gears worked normally without any problems, I parked the car again and checked, same thing 5th not going in and 6th none existent. Guys is that normal feature with this car or should I visit mechanic?