Stretching/Flexibility issues.

When I do the stretch illustrated below, my right knee can almost go as far as my shoulder but my left knee only goes about as far as what you can see in the diagram. With my left leg, there is a strange pain in the upper quarter/third of the left quad. I've looked at countless diagrams of the upper leg but I can't isolate the exact muscle(s).
Anyone know what the problem could be? There is no pain on the right side but I can create it artificially, by pulling the right knee towards my left shoulder instead, moving my ankle outwards.
In all other muscles, i'm equally flexible on both sides. It's just here where there is a left/right imbalance.
Anyone know what the problem could be? There is no pain on the right side but I can create it artificially, by pulling the right knee towards my left shoulder instead, moving my ankle outwards.
In all other muscles, i'm equally flexible on both sides. It's just here where there is a left/right imbalance.

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can you do 1-legged squats the same on both sides?
do you get the pain when legs are squashed up like this on the bike? when you are 'aero'?
Reply of the year imo
1) Right used to be. Not anymore.
2) Yes.
3) Not at all and my legs come up to my chest in almost the same position.
Carbon 456
456 lefty
Pompino
White Inbred
You recommended it to me a while ago, but I stretched my hip flexors a lot (still do) and virtually all my imbalances disappeared so I felt no need to do it at the time.
PTP Runner Up 2015
Wherabouts round the leg - inside, front etc.
Maybe gluteus medius tightness?
Carbon 456
456 lefty
Pompino
White Inbred