Distorted image, but fine on thumbnail

[qgib]

Author Name: Mina Jambajantsan (Mina Jambajantsan)
Original Redmine Issue: 18480
Affected QGIS version: 3.0.0
Redmine category:rasters

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Dear QGIS,
I'm trying to make a contour map with DEM tiff files, but I have a distorted map which looks perfect on thumbnail.
How can I fix it?
As you can see, the ruins on the thumbnail are nearly cube shaped, but on the main page it's more like brick-shaped.
Thank you for your help
Warmest wishes,
Mina

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• Screenshot 2018-03-19 13.00.59.png (Mina Jambajantsan)

[roya0045]

Just seem like a projection thing, I think this can be disregarded.