Welder damaging parts

hey guys i might be not be seeing my error or if it is because of new update but my printer setups ( ive tried a few ) are not working properly anymore the welders are putting in and damaging ( only steel plates that ive seen ) components after printing the parts as they go emtying all the supply before stopping the welding process all toguether ( since no more steel plates ) ive tried a new vanilla save and a modded one both seems to be doing the same thing my style of printers are stationnary projector and welders being put close to projector via pistons then pulled back at a pace that the welders have time to weld all parts ( or manually if i wish meter by meter ) to weld till projection is finished .... now i have only tested this on small grid printer for now since i usually do not print large grids i use a large grid welding ship and that did not seem to be affected for now ... that never happened to me before on this printing setup ive tried upping the pace of the pistons and slowing it down same results ((( setup for printer large grid rotor-small head-small projector -- welders x ( 6 for my printer setup )-2 large grid piston back to back attached to welders elevated 1 block by conveyor of same grid type as welders )))