Your 'vectorized' SVG may still be a bitmap — 4 checks, with measurements

When you "vectorize" an image, the result is supposed to be paths — geometry you can scale, recolor, and cut. A surprising number of tools, including Inkscape's own Trace Bitmap, instead wrap the original bitmap in an tag, so the file is a picture inside a vector wrapper. It looks fine at 100% and falls apart everywhere else. You can tell which one you got in about a minute. Here are four checks, then the numbers from a benchmark I ran.