Burned BD plays back in 4:3 only outside of computer/PowerDVD

[Adler000]

I've created a BD Disc using BDStudioLite and I am attempting to burn it to a 25GB BD-R.

I am able to successfully burn a disc, both from the BDMV/CERTIFICATE folders and from an ISO created from those folders (I've done both as tests). In both methods, the disc burns successfully, verifies, and plays back perfectly in 16:9 on PowerDVD on my computer as it should. However, when attempting to play it on my TV on both a Sony 4K Blu-Ray player and on an Xbox One S, the disc plays back in 4:3 and the image is horizontally squashed. I have triple checked the device and TV settings and there is not an issue there. I have also checked the streams in MediaInfo and they display as 16:9, so I don't know where or why this issue is arising. Other BD discs play perfectly on my Sony player and Xbox.

I'm very intrigued as to why this would be the case, especially since the finished disc plays back perfectly on PowerDVD.


For reference if needed:

BD Discs: 25GB BD-R Verbatim (https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1)

Authoring Software: BDStudioLite, muxing with tsMuxeR

Burning Software: Imgburn

Drive: Alphami External Blu-Ray Drive (https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1)

All video streams on disc are in a 1920x1080 container.
Disc plays successfully in correct aspect ratio (16:9) on drive above on PowerDVD and VLC Media Player.
Disc plays in incorrect squeezed 4:3 aspect ratio on Sony UBP-X700 4K Ultra HD Blu-Ray Player and Xbox One S.