P: Photo placed in wrong spot on map

Thanks so much for the right-click workaround. Now we need Adobe to fix the issue so that it works like it used to and supposed to work.

Ok this is a bug, easy to solve it seems, because so reproducable.  Adobe get your act together...

It happens when the screen settings in windows is different than LR:
I've got my font size to Medium in LR
and scale in windows to 100%
--> putting the pin is correct.

Just change the windows scaling to 125% -> google map changes in LR in scale! and shibang -> pin placing is wrong.  Easy to fix, because so reproduce-able as a bug (If my bug explaing as a software developer was so easy, my product wouldn't have bugs :))

I was the person who found that Setting LR to Auto for font size solved my problems.  For me, a good workaround until I solved my problem: Right click the spot you want and then select the photos. This was accurate on my systems even when the "drag and drop" was not.
Seems like the problem might be more complex.
I have two 4K screens and they both (now) work  fine.  Here are the details for those trying to make sense of all this - hope they are useful:
Screen on Windows 10 desktop: Benq SW320 with NVIDIA GeForce GTX 6GB with latest drivers from NVIDIA (the Microsoft suggested ones didn't work with the new graphics acceleration option in LR)
LR Font size set to "Auto"
Screen settings in Windows:
Font size is set to 150% (Recommended)
Resolution set to 3840 x 2160 (Recommended)
Screen on Laptop Yoga 2 Pro Windows 10 (6? years old) using onboard "Intel(R) HD Graphics Family"
LR Font size set to "Auto"
Screen settings in Windows:
Font size set to 200% (Microsoft recommends 250%)
Resolution set to 3200 x 1800 (Recommended)

I have a 4K screen with Windows 10, and use the Windows display settings to make the text larger. Font size on Lightroom Classic is (and has always been) set to automatic (as suggested as a workaround in a comment), but dropping photos on the map will drop them to the right/down from the intended location when scale on Windows display settings is anything other than 100%.

The position offset is smallest in the top-left corner of the screen, and will increase towards the bottom-right corner, proportionally to the position. It appears obvious that there is an offset error that does not take the Windows display scaling into account.

My current workaround is just to change the scaling to 100% when I'm dropping photos on the map, but I would really appreciate not having to resort to such extra steps.

See my solution below in a separate post.  John R Ellis - there was a hint in your question "did you try 100%" there is no 100% in LR.  but there is in Windows.  So after some fiddling so I think its the two working together (or not) that is the problem.  Set the LR one to Auto and use the Windows one to set size.  There may be other options I did not do extensive testing of the variables.

And I have solved the problem (for me at least).  I set the Windows/Settings/Display/Scale and Layout - 200% and the LR/Preferences/Interface/Font Size to "Automatic".  (It also worked fine for the 100% setting in Windows).
The point being the LR setting is set to Automatic (and fonts are controlled only through the windows setting).  And you need to restart LR after changing the windows setting (and LR setting for that matter).
BTW Cntrl click and also right click did work fine as a work around.

In the discussion above I think there might be confusion about whether we are talking about the font size setting in Windows or in LR.  I was certainly confused.

I still have a problem with the eyedropper on White balance its about 1/2 an eyedropper length out. The other Targeted adjustment tools are also out but it doesn't look like as much.

I'm facing the same bug (on a 4k screen (Radeon RX470 video card)):
After droppingthe image it jumps to a different spot, behaviour changes with "fonts" setting but never works correctly.

Together with this issue about wrong location of the white balance dropper and  the same bug with the alignment of the horizon and alignment tools, one somehow has the impression that LR somehow guesses where the mouse pointer could be...
In some functionalities (spot removal, etc.) it works correctly independent of any font sizes and monitor scaling options, in other tools it always makes troubles finding the right position.

Adobe, please unify this mouse readings by implementing it clean together for all tools!
Having bugs like this for years doesn't meet professional standards!

Thanks.  Windows 10 Control-click on map location worked for me