image size

I have an image that was initially generated by Midjourney and then upscaled using Topaz Gigapixel. Here are the details of the workflow and the issue I'm encountering:

Original Image Details:

Dimensions: 10752 px x 7168 px

Size: 441.0 MB

Resolution: 300 pixels/inch

Print Size: 91.03 cm x 60.69 cm

I resized the image to 50 cm x 40 cm.

The new pixel dimensions are 5906 px x 4724 px.

The resolution remained at 300 pixels/inch.

The file size changed to 159.6 MB.

Export Settings:

I exported the image as a JPG with the following settings:

Format: JPG

Quality: High

Image Size: 5906 px x 4724 px

Scale: 100%

Resample: Bicubic Automatic

Color Space: Convert to sRGB

Issue After Exporting:

Upon reopening the exported JPG file in Photoshop, the image size changed to:

Width: 208.35 cm

Height: 166.65 cm

Resolution: 72 pixels/inch

Dimensions: 5906 px x 4724 px

File Size: 79.8 MB

My question is :

Why does the print size of the image change to 208.35 cm x 166.65 cm with a resolution of 72 pixels/inch when reopening the file, even though it was set to 50 cm x 40 cm at 300 pixels/inch before export?

Could the upscaling process in Topaz Gigapixel affect the resolution and dimensions in a way that leads to this discrepancy?

How can I ensure that the image maintains the correct print size of 50 cm x 40 cm with a resolution of 300 pixels/inch throughout the entire workflow, including after exporting and reopening the file?