Sticky add to cart not responsive?

Hi,

I just observed some behaviour indicating that the plugin seems not to be fully responsive code.
Is that possible?

It occurred when using caching together with variation swatches and sticky cart.
When a page got loaded on desktop first (showing the variants as swatches in the sticky add to cart), the variant buttons were also shown on the mobile device instead of mobile approach to open a flyout for variants upon add to cart.

Configuring the cache to store separate files for mobile and desktop solved the issue.
Yet, it is not a good solution, because it requires the cache to store the double amount of data.
Also, prefilling the cache takes the double amount of time.

I at the moment worked around it by configuring the cache to be device-sensitive, but this should not be final solution.

Any ideas on it?

Thanks a lot
Stefan