@galija apologies for not replying earlier!
Alas, I was unable to find a solution for this. My site behaves the same way which I didn’t notice before you mentioned this in your comment. This behaviour appears to be “normal” for a Wix site… No more ranting from me 
Here’s another thread on the issue: https://www.wix.com/code/home/forum/community-discussion/clear-the-query-parameters-using-code
I have tried to “cheat it” by adding:
wixLocation.query = '';
but it results as
TypeError: setting getter-only property "query"
inside the browser console.
Here’s the official documentation: wix-location-frontend - Velo API Reference - Wix.com - no sign of “setters”, only “getters”. So, I assume you can’t modify or clear these parameters.
Better luck for us next time.