Hi
@Ellie_Wilko.
Have you looked at your injection technique in your legs? I know if I gave in a slightly awkward angle or crooked for want of a better term it would not be absorbed as well. The other thing to consider may be needle length for the different area. Perhaps if you have more weight around your thighs you may need a longer needle for that specific area? Are you avoiding any scarred or stretch mark areas (if you have them?)
Is it that it does not appear to work at all or do you feel it is a delayed response?
Do you have a good diabetes nurse specialist you could liaise with for support and to see their thoughts?
Also depends on what sites you are comparing them too? Arms notoriously are quicker to absorb.
Hope this helps.
Best of luck xxx