The price appears with a delay of several secondds + is incorrect in some place

Hi, I have two issues:

1) The price in base currency appears normally. The price in additional currencies appears with a delay of several seconds (there is a completely random number for a few seconds). How to fix it?

2) Not all items in the store display correct prices. For example, this product configurator displays prices other than what they should be converted. How to fix it?

https://mguide.eu/en/configurator/

PS. At this point, the plugin is disabled. I provide login details so that you can use it.