Water isn't going draining to the right pipe but onto my floor, what is the problem?

There is water coming thur my walls from my bathtub when I let the water out, but it doesn't do it when I shower can you tell me what is the problem please. Could it be stopped up or a hole in one the tub pipe? Please help.

So your drain leaks after a bath but not during a shower. Right? Your tub/shower uses the same drain for both. The only difference is when you drain a tub there is about 20 gallons all released at once but a shower is more like 1.6 gal/minute, slower draining smaller volume. I think you have a drain pipe leak that is not affected much at low volume. Can you access the trap under the tub?