I have an Orion XT8 Intelliscope.
I have lots of light around me. Street lights and house lights. Nothing dark about my site.
I do get stray reflections in the eyepieces.
What I have learned to do is to use my hand to shield around the eyepiece at various angles to see if I can block a light source. Usually I find one that is somehow reflecting off my end of the eyepiece.
In the winter I use a hooded sweatshirt to cover the focuser as I am viewing. In warmer months I use a baseball cap with the wide brim turned in various directions to block that stray light.
Try using your hand to see if you can block a stray light source.
The other thing I have is a flexible dew shield from an 8" SCT that fits perfectly over the end of my Dob.
https://www.astrozap.com/scripts/pro...?idCategory=25
This helps block any stray light or reflections from entering the tube or interfering with the secondary. This has helped too.