Very weird thing just happened in the `edit` screen

It happened, and I dismissed it, but then thought it should be something to mention.

It didn't take much effort to invoke the problem again.

This is the screen as it was:

I then drag a function node onto the screen. NOTHING ELSE

And this is what I see:

How did those two connections happen?

weird!

Oh, details:
NR 1.1.2
Dashboard 2.23.0
RasPi

Raspberry Pi 2 Model B Rev 1.1

PRETTY_NAME="Raspbian GNU/Linux 9 (stretch)"
NAME="Raspbian GNU/Linux"
VERSION_ID="9"
VERSION="9 (stretch)"
VERSION_CODENAME=stretch
ID=raspbian
ID_LIKE=debian
HOME_URL="http://www.raspbian.org/"
SUPPORT_URL="http://www.raspbian.org/RaspbianForums"
BUG_REPORT_URL="http://www.raspbian.org/RaspbianBugs"

Raspberry Pi reference 2017-09-07
Generated using pi-gen, https://github.com/RPi-Distro/pi-gen, 496e41575eeb9fa13f394ffb407b7bc1d00b21c2, stage5
Linux BedPi 4.19.66-v7+ #1253 SMP Thu Aug 15 11:49:46 BST 2019 armv7l GNU/Linux

Update:

It is still happening.

Today again it has happened in TWO different times.
Or, once, and I noticed it has two different places where the rogue node is put.

Picture below is the part of the flow on which I am working.

I drag a function node onto the flow.

Note where the node is put and where in the flow it connects.

Or if I moved the function node slightly see the other place where it connects.

Originally it happened on 12 Aug
Today is 23 Aug

I have been using NR in the mean time.
(As others will agree.)

This isn't/wasn't just a once off.

It might be caused by the theme. Have you updated the theme as well ?

Yes I have.

Sorry, I can't remember the name.

It was mentioned here a while back.

Found it.

This one

After thought.

Ok, it could be the theme.

I have it installed on four machines.

To date it has only happened on the one machine.

That machine is a remote machine and though it gets edited, it is not edited as much as this machine, and the other two get their fair share of editing as well.

None of them have shown this problem to date.