Inaccurate MAM bottle measurement

[SleepyMumz]

Has anyone else found that the MAM bottle measurements are wrong?
I exclusively pump breast milk and pour it into smaller containers with their own measurements for millimetres, however when pouring it into the MAM bottle it seems to be 1 oz less than what I apparently pumped so then I've topped up the bottle.
Recently I've been wondering why my girls not been finishing her bottle, but if the MAM bottles are wrong I've been trying to give a 4 month old almost 7oz per feed....

I also exclusively pumped and used Mam bottles. I don't think any bottles ever agreed with anything else tbh! Sterifeed, Medela, Mam, some random purple one I got secondhand, all different. We always went by the Mam volumes as that's what we poured into from my big pitchers of milk. 7oz is an awful lot of breast milk- volumes of breast milk don't increase significantly as baby grows unlike formula, it's the composition that changes. My baby took about 5oz consistently from 2 months until changing to formula at 9.5 months.
But don't worry too much about amounts- feed to her demand, if you see she's generally taking eg 5oz from your 7oz provided, just put 5oz in the next bottle.

Thank you for the reply!
I'm glad it's not just me being dumb and that it seems to be a universal issue with lots of bottles saying different things.
I believe my baby girl is drinking around 6oz consistently which is what my HV said she should be having for her weight. It's more of a nuisance than anything that all the measurements are off just because I thought I was losing the plot pouring milk back and forth