Dropdowns open on wrong display

[bertday]

What is the bug or the crash?

When I click a dropdown selector in the QGIS UI, such as setting the display name for a layer, the options are displayed floating on a different screen (MacBook monitor vs. external display). I've tried creating a new QGIS profile and I'm still getting the same result. It's a little hard to capture since it's across two screens, but I will try to drop some screenshots below.

This is really slowing me down as a QGIS user — would love to know what may be causing the issue, and if I can help contribute to a solution.

EDIT: I think this a bit more general of a problem. I get it when opening the Properties dialog as well. It seems like any "popover" UI element (not sure of the right technical term) is liable to open on the opposing display.

Main Display

Secondary Display

---

But then randomly it will work correctly...

Steps to reproduce the issue

1. Go to the properties for a layer
2. Select any dropdown, such as the Display > Display Name

Versions

QGIS version	3.38.3-Grenoble	QGIS code revision	37f9e6e
Qt version	5.15.2
Python version	3.9.5
GDAL/OGR version	3.3.2
PROJ version	8.1.1
EPSG Registry database version	v10.028 (2021-07-07)
GEOS version	3.9.1-CAPI-1.14.2
SQLite version	3.35.2
PDAL version	2.3.0
PostgreSQL client version	unknown
SpatiaLite version	5.0.1
QWT version	6.1.6
QScintilla2 version	2.11.5
OS version	macOS 14.6
Active Python plugins
zoom_level	0.1
quick_map_services	0.19.33
nominatim	1.4.5
latlontools	3.6.11
processing	2.12.99
grassprovider	2.12.99
db_manager	0.1.20
MetaSearch	0.3.6

QGIS version 3.38.3-Grenoble QGIS code revision [37f9e6e](https://github.com/qgis/QGIS/commit/37f9e6efeec) Qt version 5.15.2 Python version 3.9.5 GDAL/OGR version 3.3.2 PROJ version 8.1.1 EPSG Registry database version v10.028 (2021-07-07) GEOS version 3.9.1-CAPI-1.14.2 SQLite version 3.35.2 PDAL version 2.3.0 PostgreSQL client version unknown SpatiaLite version 5.0.1 QWT version 6.1.6 QScintilla2 version 2.11.5 OS version macOS 14.6

Active Python plugins
zoom_level
0.1
quick_map_services
0.19.33
nominatim
1.4.5
latlontools
3.6.11
processing
2.12.99
grassprovider
2.12.99
db_manager
0.1.20
MetaSearch
0.3.6

Supported QGIS version

• I'm running a supported QGIS version according to the roadmap.

New profile

• I tried with a new QGIS profile

Additional context

I've tried dragging the main QGIS window to my other monitor to see if that helps, but I get the same results, i.e. dropdowns and other dialogs open on the opposite monitor.

[bertday]

Also reported on StackExchange here: QGIS context menu always opens on different screen