You most likely have auto-sell turned on on your multi-battles. 

No its off.

Agree with Lxzy, if you are getting no gear on multi-battles you have auto-sell checked.  Common problem. Still better of farming gear in dungeons for the most par, imho. 5* epic or better beats 6* common speed boots.

100% it's wrong settings on multibattle. Record a video where you set your multibattle up properly yet you still don't get artifacts

It sounds like you're wasting a lot of energy farming poor gear in the nightmare campaign... nobody ever really NEEDS 6* speed boots, not unless they're trying to compete in platinum arena or something, for the rest of us it's nice to have 6* speed boots but if you don't have them, then you use 5* and you put an extra speed sub-stat or glyph somewhere else. 

I am very sure its off. I am not using mulibattle. And if I used it, it would have to be sold every time.

I keep running out of speed, even with 3 speedsets and 5* speed boots. 

so i have to have speedboots 6 *.  They are still faster in the arena. I can't get to the 200 speed for (Apothecary)  I also put another speed champion Gorgorab at Apothecary, but it doesn't help. 

No, you need speed substats on your other items... not common speed gear.  That is the problem

The gear that dropped from the spider, there has never been speed in the substats.