These look like residual "flight lines" from some earlier
incarnation of the schematic, now unrelated to current
componentry. You could look at the bindkey list for any
keys that look like they pertain to layout synthesis,
draw-flight-lines, etc. and then for its inverse. I do not
let the computer do my floor planning so I never make
use of those features, but I recognize them.
You might also just determine which layer in the DRF these
linea are, and turn it back off. Though it may be one that
is not on the "valid" list, and need you to dig deeper.