Mistakes must be fixed in all styles, not just the one that was rejected. If there is a mistake in one style, most likely it will be in other styles as well.
Gradations of mistakes occurrence among designers. Most often, "popular" mistakes occur due to carelessness when checking the set before sending it to the art director.
<aside> 🔵 No one did it
</aside>
<aside> 🔴 Happening rarely
</aside>
<aside> 🟡 Fifty fifty
</aside>
<aside> 🟢 Almost every set has this mistake
</aside>
🔴

Why is this happening?
The designer tried to make a creative concept of the icon, but in the understanding of Flaticon, the concept of the icon became different from what the designer was trying to convey. Everything in the world is subjective and what the creator understands may not be understood by the people, but we are not talking about creativity, but about the benefits of people and business.
How to fix it?
Redesign the icon for a clearer concept
🔵

Why is this happening?
First of all, Flaticon is positioned as a company that provides a wide range of icons, and its main task is to provide its user with quality icons, as well as to profit from the sale of these icons. Therefore, some icons may be rejected due to limited commercial value. In short, no one is going to buy a bad product. Yes, this is a bad icon!
How to fix it?
Follow the rules and guidelines for icon design
🟡

Why is this happening?
How to fix it?
Be attentive, follow guide the creation of icons and check the icon
Wrong
True
Wrong
True
Wrong
True
Wrong
True
Wrong
True
Wrong
Wrong
Wrong
True