As the title says, when I remove a pickup tower I (didn't test with II yet) manually, the radius remains permanently. If I place it again and remove it with a (nano)bot the radius goes away.

Hope it helps!

Thanks for reporting.
I will look into the logic to make that properly removed.

PS: Currently the rendering of radius square is checked when a pickup tower is (un)selected. So (un)highlighting another pickup tower should remove any remnant radius square. (I expect pickup tower II and III will have the same behaviour.)

Just released new version 0.17.5.
The code is rewritten, which should handle the radius square much better.
This (hopefully) should remove any remnant radius square left in save game as well.

Confirmed fixed for new instances - not sure for old ones (don't have saves to test) but thanks for the fix!