It’s definitely affected and it’s definitely normal. Tweaking a gig will always make it drop out for awhile. When it returns it may perform better, worse or it just might not return if the Editors find something they aren’t totally happy with. They don’t tell us exactly what to do, so you either have to risk playing with edits or leave it alone. I think most people tweak if the gig isn’t performing well anyway, but if it’s performing very well it may be best not to pick that time to edit.
I don’t think there really is at the moment, at least as far as Fiverr staff is concerned. If a glitch happens they may have to fix it manually, but search seems to be doing pretty much what they intend right now.