we have those, the amount of invalid clicks in adwords does not mach the ones i see in my logs, there 20-40% difference where adwords shows less. i cannot fix t

we have those, the amount of invalid clicks in adwords does not mach the ones i see in my logs, there 20-40% difference where adwords shows less. i cannot fix that from my site. i block ip ranges when i find them but they can just move.