Yes, a better description of exactly what is leaking will help. If it's the actual tank, is it plastic? Since baitwell tanks don't completely fill and aren't under pressure, this must be a quite large crack for water to be simply splashing out of.
I have a 2022 canyon 271 the bait well will fill all the way up. there is an overflow at the top make sure it is not plugged. The bait well is fiberglass I doubt it is leaking. Also if you run with the ball valve open it will fill up.
Running the boat with pump on or off will cause the tank to overflow. Should have a check valve IMHO but it is what it is. If not draining fast enough, try snaking the line. Could cut down the return pipe a bit too to get it to start draining at a lower level. Not too much or you'll hamper performance of the baitwell and longevity of the bait.