Hello,
Sorry for the troubles with this, with your help we can narrow this down and solve it.
Thanks for providing the links I saw the issue and looked at the source code and it looks like something else is adding the price to what our plugin creates so it is doubling it up.
Can you please follow our Testing For Conflicts guide to see if you can find the source of it:
https://theeventscalendar.com/support/documentation/testing-for-conflicts/
I think we could just hide it with css too if it comes to that.
Let me know what you find out from the test.
Thanks