I have the same problem.
The total orders on shopify admin panel is different from the transactions on Google Analytics on same date period.
Revenue has the same problem.
I have the same issue, the difference is huge.
In the shopify dashboard I see 492 sessions for Month to date, and in Google Analytics I see 30 sessions for the same period of time, there has to be something wrong, and like everybody else, I´ve just set the GA code on my store preferences section, under the Google Analytics section.
Anyone else has such a large discrepancy?