Gibberish links

It’s not really gibberish, it’s URL encoding that resolves back to the Cyrillic/Russian text you initially assigned. URL encoding ensures maximum compatibility. Such as in older email clients. Modern browsers should be able to handle Cyrillic without encoding.

Where are you seeing these “gibberish”-like links? I don’t see any on your site.

The gibberish links should not impact social sharing, on the contrary they should improve compatibility. If you’re having trouble with social sharing, seek assistance through the dedicated support channel of which ever plugin is responsible for inserting the OG and similar sharing tags.