Why is alarming? Is normal. Fees on LN will always be variable. Don't make too much case for that.
And read my guides. I did a lot of testing in all these 10 years with Bitcoin and all these tests became guides. For example this one: https://darthcoin.substack.com/p/private-lightning-nodes https://darthcoin.substack.com/p/managing-lightning-node-liquidity