Right!
It's zapper from Picket Extender!

LFarquaad wrote: ↑

Tue Mar 12, 2019 9:03 pm

You probably assigned a random keybinding to “Undo”. I would guess scroll up or down Happened to me as I had to reconfigure controls after upgrading.

Just got the same idea. Nope. Ctrl+Z.

Hi!
Please read this thread.
viewtopic.php?f=23&t=67561
Are there any chance those marks caused by picker mods?

UPD. It's zapper. The same key binding as undo.

Klonan wrote: ↑

Tue Mar 12, 2019 8:01 pm

Its probably one of your mods.

Agree.
Are there any way to find out which one?
I'd bet on Picker *

Again

I'm constantly finding random items (belts and power poles) marked for deconstruction, mostly near mines. Mods: Aicraft Blueprint_Flip_Turn Bottleneck Crafting speed research Equipment Plus Portable Engine Loader Redux Picker Atheneum Picker Dollied Picker Extender Space Mod Squeak Through Warehousi...

Fixed in 0.17.11

Same for me, but i've pressed 'e' button.

No mods.
Fresh start with research queue enabled.