Edge softness can be normal with consumer zoom lenses, especially toward the corners, but the strong blur described suggests something else may also be happening.

Based on the answers, likely causes to check are:

• incorrect lens correction/profile applied in software, especially if the EXIF lens model does not match the image date or actual lens version
• a low-quality or damaged front filter such as a UV or macro filter
• dirt, haze, or fungus in the lens
• normal corner softness/chromatic aberration from the 18-55mm kit lens

The most suspicious clue is the reported metadata mismatch: if editing software applied the wrong Canon 18-55mm lens profile, it could create odd edge blur or vignetting artifacts.

Best troubleshooting steps:

1. Remove any filter and test again.
2. Inspect and clean the lens.
3. Check the exact lens model and compare it with the EXIF data.
4. Disable lens corrections in the raw editor and recheck the file.
5. Compare with another lens or another copy of the same lens.

Metering mode is unlikely to be the cause of edge blur.