I see, you are right.
If you open the file 63CMNFighter Squadron (1916).mdl, that I guess corresponds to level 3, you may read
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UID = 63
NationTag = CMN
Name = Fighter Squadron (1916)
Alias = mdl_CMN_Air_Fig_3
ShortName = Fight. Sqd.
Text = $mdl_txt_CMN_Air_Fig3
Family = $famAirFighter
ImageID = symbol_EarlyLevelBomber.png
While earlier, in 1914, the symbol is that of an early fighter.
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UID = 61
NationTag = CMN
Name = Fighter Squadron (1914)
Alias = mdl_CMN_Air_Fig_1
ShortName = Fight. Sqd.
Text = $mdl_txt_CMN_Air_Fig1
Family = $famAirFighter
ImageID = symbol_EarlyFighter.png
So the NATO symbol is of a level bomber from 1916 model (level 3) and also in 1918 or 4.
Bug or intended I do not know, because there are no symbols for late or advanced fighters. It is confusing, so they should have used the symbol early fighter, or better called just fighter along the war.
In the manual it is said that
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Aviation Research: Aviation research will improve the fighting capabilities of air units, and at later levels improve the bombing capabilities as well. Early planes are incapable of combat, and maintaining an edge in this category is crucial for claiming the skies (and in turn keeping tabs on enemy positions and strength).
That must be the reason to use a bomber symbol. While the model "60CMNAircraft Squadron (early).mdl" uses "symbol_EarlyRecoPlaneAlt.png".
You may fix it just by changing the line.
I do not find a symbol or model for a naval bomber, may you post a pic?