Issue with reflection

I have a simple setup for my scene in unity.
There are two planes as walls and three cubes as pillars.
The floor is also a plane with scale = 3.
I have added a reflection probe and I expect to see the reflection of the 3 pillars.
The reflection does happen but the proportion is not correct due to the scaling of the floor.

How can I have floor with scale = 3 but keep reflection correct as per the size of the pillars and walls?
Below is a screenshot of what I have now.

Thanks in advance!