It is commonplace to hear those differences after you switch.
It boils down quite a bit to human psychology and how our brains work.
If you spend thousands of dollars on something you consciously or subconsciously expect to hear a difference.
The truth is, the cables were either doing something wrong that you heard as a positive change, or they were better than what you had used previously, which could have been very lousy cables.
Please make sure you level match and play exactly the same tracks when trying to determine if there is in fact a difference in cables.

