UPDATE. In case someone have same problem so it can use this quick fix.
Checking fonts I found out this:
Default body font is Source Sans Pro and should be showing extended Latin characters as they are included in that font
Default header font is Raleway and doesn’t have extended Latin characters so its using different font to produce missing letter thus the differences in sizes.
Solution to this was easy I done this:
In customizer under font sub-menu, in body font options the default Font name/style/sets was:
changed it to:
For header fonts always under font sub-menu, in Heading fonts options
‘Source Sans Pro’, sans-serif
To easily check if the font you want to use have extended characters check this link