So I got the Panokseon, and loaded it up with around 21 sailors, realized I wasn't getting any exp on them. 

Before this boat, I didn't have a boat that could use so many sailors, and my guildie was saying that its because I have too many on board. Yesterday when I got the ship, I had 95 / 150 cabin used up and was getting experience on the sailors. Later when I noticed I wasn't full, I added more sailors to see my max stats and left it as is. My level one inno sailor is still at 0 exp. 

I'm new to this type of sailor count, but I was under the assumption that I could load my ship up with sailors and level them all. Is this a bug or intended?

Edit(this was a comment, but putting it in OP):

So I've confirmed it with people in the Sailing Discord in both NA and EU, as well as a guildie. 

If you have 21+ sailors on board the Panokseon, you do not gain any Sailor EXP when doing any sea content. This includes Bartering, Sailing and hunting Sea Monsters in any ocean. I thought maybe cabin size might play a factor too, but its solely tied to Sailor count.

Test 1(Me): 21 sailors on board, no EXP when killing random sea monsters on the way from OE to Nampo. Had a level one Inno, no EXP gained.
Test 2(Me): 19 sailors on board, EXP gained from killing a single Goldmont Large Battleship. The Inno leveled to 3 by the time I got back to Nampo to change things out.
Test 3(My Advisor): 30 sailors on board, one was a level one inno, no EXP gained when killing sea monsters on the way from Nampo to the Margoria Pirate grind zone. None gained from grinding said pirate ships either.
Test 4(Me): 20 sailors on board and gained exp on a new level 1 inno sailor.

Feel free to check for yourself if you have the Panok, but its looking like a bug exists with sailors when using 21 or more on the Panok. I wouldn't be surprised if this existed before panok, and the sole reason we know about it now is because we're actually able to use 21 or more sailors. lol.

Besides the fact that the panok chugs rations like its starving, that the flamethrower literally does negative damage, doesn't cc and locks you in place - literally having no use or place in any content, or the fact that only the captain can repair the boat, this sailor bug is the icing on the cardboard box cake that is the Panokseon. At the very least PA needs to fix this. 

I'm curious, were the sailors in the slots filled earlier still getting exp?

So I've confirmed it with people in the Sailing Discord in both NA and EU, as well as a guildie. 

If you have 21+ sailors on board the Panokseon, you do not gain any Sailor EXP when doing any sea content. This includes Bartering, Sailing and hunting Sea Monsters in any ocean. I thought maybe cabin size might play a factor too, but its solely tied to Sailor count.

Test 1(Me): 21 sailors on board, no EXP when killing random sea monsters on the way from OE to Nampo. Had a level one Inno, no EXP gained.
Test 2(Me): 19 sailors on board, EXP gained from killing a single Goldmont Large Battleship. The Inno leveled to 3 by the time I got back to Nampo to change things out.
Test 3(My Advisor): 30 sailors on board, one was a level one inno, no EXP gained when killing sea monsters on the way from Nampo to the Margoria Pirate grind zone. None gained from grinding said pirate ships either.
Test 4(Me): 20 sailors on board and gained exp on a new level 1 inno sailor.

Feel free to check for yourself if you have the Panok, but its looking like a bug exists with sailors when using 21 or more on the Panok. I wouldn't be surprised if this existed before panok, and the sole reason we know about it now is because we're actually able to use 21 or more sailors. lol.

Besides the fact that the panok chugs rations like its starving, that the flamethrower literally does negative damage, doesn't cc and locks you in place - literally having no use or place in any content, or the fact that only the captain can repair the boat, this sailor bug is the icing on the cardboard box cake that is the Panokseon. At the very least PA needs to fix this.