Based on the answers provided, the corrections needed for the 3D object are:

1. Adjust the position of the two cylinders so that they are connected at the center of the base of the rectangular prism. This will ensure that the cylinders are not positioned towards one end of the rectangular prism.

2. Verify and adjust the size of the cylinders to ensure each is 1/4th the size of the rectangular prism. This will clarify the proportion between the cylinders and the rectangular prism.