Hello!
When using emojis on phone, some of them are not visible properly when opening the site on PC.
Can I change that somehow?
That is how it is showed on PC:

All you can try is updating your devices in order to use the latest font files.
Even then the result may be not 100% perfect and some emojis may still look different, appear black/white or are missing completely. See
https://www.parallels.com/blogs/emojis-revisited/
Due to the many requests in the past for additonal features and components we have decided to develope a premium version. Features like Hashtags, Videos, Polls, Events, Stories, Link Preview, etc included in it.
$199 (Life Time)