200 tdi dipstick tube length

New to me defender 200 tdi ,changing oil I tend to put 6 litres in the top up another litre or so till she reads correct on the dip stick

Well after putting in 6 litres dispatch shows way overfill

Much head scratching and comparing with another 200 later ,dip sticks are the same length but dipstick tube is about 2 inches shorter

Any suggestions ?

Dipstick tube has been pushed into sump to far, measure correct amount of oil, pour into engine. Allow to settle adjust dipstick tube, to show oil level at max. Ht on dipstick. Tighten tube up to secure

Thanks I never would of thought of that!

Disco 200 has a bracket fixed to the inlet manifold so that doesn't happen.