Slight calf nggle when running on treadmill, don't get it when running outside

Im training for the London Marathon and had a knee acl reconstruction 8 months ago. Im back in training and going well however when I run on the treadmill after a weights session I feel a niggle in the top of my calf, like a potential strain, its been there for months, yet when I run outside upto 10 miles now on a sunday its not there.

Strange, anyone any ideas.

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