shower pan

It looks to us like the shower walls are seperating from the shower pan, potential badness. Are we correct in our assessment and, if so, what is the fix? We are full-timers and cannot take our rig into the dealer for warranty service. If not normal, what sealant should one use? Thank you all...

I ordered one of these on Amazon and thought that could be an interesting shower pan for grey water capture either in or out of the camper. Packs down really small. Could be filled with beer and Ice for the next ATC camper rally, and of course my Black Lab Ria would love it for it's original...