Anyone here ever use https://pancake.kiemtienonline360.com/#/swap as a testnet for pancakeswap?

It uses a different router to pancake testnet router, when I'm trying to use this I can't seem to get SwapAndLiquify to work, when I check internal function of how many tokens required to make swap, it's calling me I have an internal Json error, overflow..

So I'm assuming there's enough tokens to make the swap, but for some reason it's not working.