Sidecar Apple Pencil problem

hello there,

Photoshop and sidecar isn't working well with my Apple Pencil anymore.

I reinstalled Mac OS a few weeks ago. Since that time I do have this issue that when I try to draw or erase something in photoshop via sidecar on my tablet, the size of the pencil (what is actually drawn) isn't the size of what I've set up.

i've attatced a picture to illustrate my problem.

both dots have the same size-adjustments 

I hadn't that issue before. Maybe I just have to set up something but I can't tell what it is and I can't find anything in the internet.

I have a MacBook Pro 2017 and an iPad Pro 2018 with Apple Pencil 2. Gen. 

Thank you