Over the years many threads have revolved around the poor operation of a circuit built on a breadboard, the type with lots of strips where components can be plugged in to make the connections.
The usual problem is when the circuit is expected to operate at more than a few kilohertz, strange things start happening.
When someone asks a question about this, all the experienced guys here will jump in and tell that the breadboard is totally unsuitable for use at "RF".
What I have never seen...