While playing K2 Spaced Out, using a perk point to increase range causes it to decrease instead from 25 to 19.

Hello! I'm not familar with K2 Spaced Out, could you provide more information as to why you guess this is happening? (e.g.: Is K2 Spaced Out doing something specific with the turrets or range, and it might collide with my implementation?) I'll look into it on my end and try to push a fix in the next release.

Thanks for bringing this up!
edit: could you also confirm to me that you were using the latest mods' version for both mods (K2 S.O. and mine)?

K2 spaced out makes the turrets base range 25, my guess is that your mod takes into account what the turrets range is in vanilla which is 18.
Yes this mod 8.1 and K2 spaced out are up to date.
On a recent note with 8.1 there is no scroll bar for the perk section, so if you have a high level turret you haven't done anything with you can't interact with anything past lv 30

I addressed the scrollbar into the latest (0.9) release, as well as the K2 Spaced Out bug, let me know if this did fix the issue! :)

I'm having some trouble working around the GUI limitation of Factorio, so you should except some changes and some bugs in the upcoming patches until I can stabilize it, the mod will probably not expand in terms of feature up until the 1.0.0 release, on which I aim to iron out all the visual polishing and features to a stable state.

Yes update 9 did fix it the turret now shows 26 when upgrading range. Thank you.

Thanks for bringing this up and using the mod! I wasn't intending it to be used by anyone beside my friend and I so it came as a bit of a surprise, feel free to report any other bugs or feedback you have here.

Have fun