For some reason the HTML control used in “Factuurnummer” is by default very high, but i want it to be the same height as “Intern factuurnummer”

At the subject page these are the settings, as you can see Field height in positions is empty. I can put in 1 for example but then still it is not the same height.

I checked the domain settings and these are as follows. So why is the HTML control taking so much height when it's not configured?

