Since version 27.1 photoshop the lasso selection tool creates random selections . Version 27.0 is fine.

When you use the lasso selection tool, click with your mouse on a place on the photo, many times it starts to select random figures. When this is not happening sometimes you can trigger it by making a selection and then delete this selection by Crtr-D. And then click left with the mouse on 1 place. 

I have test it on several versions. But version 27.0 is oke. The newer versions and the last one have this bug.