Scaffolding Fall damage going down

I was playing minecraft and I took fall damage going down scaffolding. I was near the edge of the scaffolding going down and I took fall damage. I tried going down again and took fall damage again. It scaled with the height I went down. After dying I re-spawned and it fixed itself, but one of my friends had the same thing happen on the same server. We had a relm running and playing on it casually in survival.  It  was lagy because we had a redstone contraptions. We destroyed the scaffolding and moved it and we no longer took fall damage from scaffolding.