Hello Tavaro,
The source of this second Focus Point is from the Lingering Composition Class Feat that is granted by the Maestro Muse. When this feat is added it grants the Lingering Composition Focus Spell and also increases the Focus Pool by 1.
Take this and add on top of the existing Focus Pool that is granted by the Composition Spells Class Feature and you will find any Maestro Bard will begin play with two Focus Points.
I hope this helps clarify what you're seeing and why, I'm also linking the official online reference document for the feature below too.
Lingering Composition Feat
Thanks!