Loop to loop is bad - Try attaching your leader to the fly line this way - Troutbitten
Fly Line To Leader Connections
HOW TO ATTACH LEADER TO FLY LINE, FLY FISHING 101
Surgeon's Loop Knot - Easiest Leader To Fly Line Loop To Loop - Fly Fishing Knots
Seven knots for attaching a fly to leader/tippet material, and how to tie them
How to correctly attach a sink tip to a leader
Best knots for flyfishing.
How To - Fly Series 04: Make an easy practice fly to use when learning to cast a fly rod
Is this normal for a welded loop? : r/flyfishing
How To Attach A Leader To A Fly Line
Albright Knot - The Albright Special Knot