When you run on redstone wire and then jump, there is a bug that the game will make those running particles out of the transparent part of the redstone wire appear, so if you run on redstone wires and then jump, white particles will appear behind you, i concluded that it's a bug, not a very important one, but if it happens with redstone , it probably happens with other blocks with transparent parts.
Duplicate of MC-4040, please use the search function to see if your bug has already been submitted. Currently over 45% of tickets are being closed as duplicate.