Something is very wrong with your simulator. You should be seeing bbm outputs with about 30 nsec pulses.
I suspect that the models in LTSpice are somehow built so that they expect the V- pins on each gate to be at ground, not at -2.5. As a result, the circuits are seeing transitions which just barely under the nominal 2.5 (relative to V-) levels which the IC responds to.
Try redoing your circuit using GND and +5V as your logic supply levels. You'll also have to adjust the DC level on Vx.
Also, just for future reference, when showing traces taken at different points, make the starting point for each trace at the same time. This allow us (and you) to see how different parts of the circuit are behaving at any particular time just by shifting vertically and not having to check the time base.