Just returned from a trip at Boardwalk 6/20/2023 to 6/24/2023. Was given our room ~ 3:40pm (1108 & 1110) a two bedroom lock off. Daughter went to bathroom in 1108 and told me there was turd in it. I flushed the toilet and it immediately overflowed and flooded the bathroom floor. I went to front desk and they sent house keeping and a plumber. I did mention to them at the front desk that I am not sure how well the room was cleaned since it was obvious the toilet wasnt because house keeping would have discovered the flooded toilet when they would have cleaned it and the problem would have been corrected before we were given the room. At or about 5:30pm I was the 1st one to use the toilet in room 1110, just liquid waste. I flushed this toilet and it too overflowed and flooded the bathroom. When back to front desk and they offered to set use up in another resort since they did not have any room at Boardwalk. Wife didnt want to move if they could resolve the issue since we wanted to stay at Boardwalk to be close to Epcot & Hollywood studios. They said the would. Everything seemed fine until the evening of 6/23/2023 when I went and flushed ( liquid) the toilet in room 1108, once again it backed up and flooded the floor. Plumber came and plunged the toilet and told us " you have to expect this to happen" and then told us we were not flushing the toilet properly. Well I have close to 60 years experience flushing toilets and no this shouldnt be expected to happen.