After develop the pictures i found that some

Might be film coming loose when inserting in loading spool and skipping when winding forward after making a shot. Could try bending first 1/2" of film tongue before inserting in slot in windup spool so that it won't slip out and be sure film sprocket holes are engaged with film transport sprockets and a bit under tension when loading film before closing camera cover. Your 'half-frame' problem might be that you are shooting at a 'flash' shutter setting of 1/60 when not using flash.