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Hello @kubus3418
From what I can see, you have rebuilt the single product template using Elementor, which can make some of the theme’s code to not execute (this is irrelevant of the theme chosen, as it will work the same with any theme).
Unfortunately, as long as the base single product template is modified, we cannot do much from our end to make things work “better”, since we do not have control over it anymore. It would be required to get in touch with the plugin providers for more information on how their software works like.
If you were to use the standard provided template, I can confirm that upsells and related products work perfectly on mobile, as shown here – https://ibb.co/Vj7kQYc
Hope this clears things up!
Thanks.