your viv is doing what is set to do. That's what LECA does, it wicks water back into the substrate, some people like this some don't. I personally don't like how LECA wicks water back so I use eggcrate false bottoms. Your soil doesn't matter, no matter what soil you use, if you are using leca as a drainage layer it's going to wick water back to the soil. If you don't want your soil as wet as it is, i suggest you tear out the leca and put in an eggcrate fb