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The bridge rectifier in my circuit is not turning the negative portions of my waveform to positive voltages, but is instead creating negligible negative voltage while the positive peaks are normal. Is there a bug with them?

Here is my circuit if there appears to be a problem in my implementation:

Simple problem. You have two grounds on the secondary side, one connected to the bottom AC terminal of the bridge, and the other to the (-) terminal of the bridge. This shorts out one of the diodes...

Remove the ground next to the secondary and you get a full-wave rectified output at your load.

Thank you. I thought it had worked before, but it makes sense when I think about it why it would not.

Interesting ...

The circuit above simulates with no ground return path on the input side.

That implies that there's a hidden high resistance path to ground that CircuitLab puts in for you to save a lot of head scratching (some simulators force a Gmin value in the range of 10e-14 equivalent to a resistor of 1/Gmin from all nodes to ground for this reason).