Counters not connecting at corners

[simaddict]

Hi, I have been having this problem on and off. One day it would be working, then the next I need to completely remodel my kitchen. My current project on sims is making a working replica of my house, so remodeling will not work. One thing I have tried is taking the stove out and putting a refrigerator where the stove goes. Then I took out the refrigerator and put the stove back and it worked. If I didn't explain that well enough let me know, but I hope this helped!