A couple of things, from experience. I have a similar condition.

Check out your legs to see if one is longer than the other. It is more common than you would think.

Your saddle may be adjusted up and down, and back and forth to obtain the most comfortable position. I am sensitive to front and back.

The angle of the seat can also be adjusted. If it is pointed down, move to level.

Put the saddle in a more neutral position, as the left tilt will shift more weight to the left side.

Sometimes the stem length and height is an issue. I see that you indicated a Cannondale Adventure 2, try raising or lowering the handelbars. With road bikes, longer stems are available and different angles can be used to obtain the optimum fit. It is a bit easier with road bikes as you can move your hands to different riding positions.

Some people have a dominate leg, especially if they have had a back issue.

Try pedaling with slightly more pressure on the right leg, and use the left leg as secondary.

Look at your foot position during pedaling. Is one foot pitched versus the others or square on the pedals. You did not mention if you use clip or platform pedals. If you don't use clip pedals, you can try them. Pedals can be also adjusted for pitch in and out, front and back.

Pedal through it, if one side is stronger than the other, over time your butt and back muscles will strengthen and it will be less noticeable. That has actually helped my back over time.

Don't use the discomfort as an excuse to stop riding.