Manual adjusted patient parameter is overwritten by estimated one, without feedback to user

When the user manually fills out the weight of their patient, and later fills out the age, the weight is overwritten by the estimated value corresponding to the age, instead of the manually filled out weight, without any user feedback.

For example, I select: 2.3 kg:

Then I fill out the age of my patient and the weight has changed along without any warning (not desired):

This can be dangerous, because the dosing for medication is based on weight.

This bug is not only happening for weight but also for other parameters.

So in the desired situation: manual filled out values will remain intact, even while changing other parameters that can influence the manual filled out values. If the manual filled value seems very odd due to the other patient parameters, we could generate a notification: are you sure that you filled out the right weight?
I'm not sure if that is hard to realise from a technical point of view?