Resetting PC from a USB recovery stick

I reset my laptop to factory settings by using a USB stick which I prepared before.
But some days ago before recovery I used that USB for storing some of my files and I didn't delete them. I mean I had copied some personal folders into the recovery USB stick before and didn't delete them and did a PC reset with that USB.

The installation was ok. I'm sometimes having issues such as screen is freezing ect. This is a new laptop and many driver issues ect.
I'm not sure if these are related to extra folders in recovery USB.

My question is, when performing a recovery from USB or DVD; if there are some other unrelated files or folders in that media(USB or DVD) does it matter?

No it does not matter.. Unless you over-wrote on existing file in an existing recover folder