My riding buddy has painful hips and has to get off this way,
you have a few options really.
It could be your body is not quite ready for the hours spend in the saddle, it is a really comfortable one, you could use a seat saver if your bottom has dozed off.
I also have to dismount with my left foot still in the stirrup, once your right leg is over lean on saddle and kick foot free before decending to the ground.
Very few people notice the difference!
I can't get off normally any more either. Is rather...um... interesting.
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The endurance stirrups would help I reckon.
A lady at my old stables with 2 hip replacements always dismounted onto the yard gate.
Thankfully lovely Haffies are generally quite cooperative with such operations if they know theres a carrot arriving soon))