To recreate the problem use the tool given by Twitter to build a button: https://twitter.com/about/resources/buttons#tweet
Under Button options/Share URL tick second option and enter the following:
Watch and memorize the count that appears under Preview and code.
Now reenter the same url but for mobiles:
You will get a different count though it is the same post.
Therefore viewers on mobiles get a different count than PC viewers for the same post.
How can I solve?