Hello alvaro.
I can’t see all the parameters of your project (and the waveforms in ABM1 and ABM2) but the schematic for PWM generator signal seems OK. Can you upload it?
i can’t see the picturs of your simulation. can you please add them again. Also post all the parameters you are considering here and also the exact value of all componenets. If the problem is one side only then you must check if all the componenets are connected in the right polarity.