I can reproduce this as well on MacOS. It seems to happen if I paste a word with a space before it. So if I paste " blah" it will do it. If I paste “blah”, it won’t. At least so far, in my tests.
Also if there is a space at the end of the title, or if you have any double spaces, there is a form of auto-correct, which cleans the extra whitespace. When that triggers, then it also jumps back to the beginning of the line.
I can also reproduce this on MacOS (Obsidian 0.9.20).
Regarding my use case: I trigger this regularly because I’m using @nickmilo’s suggested format for sources (S- YYYY - Type - ShortenedTitle - AuthorYear) for which I copy-paste article titles and manually remove whitespaces between words.
FWIW, this no longer reproduces for me on macOS (12.5.1) with Obsidian (0.16.1). Switching away from Obsidian then back, either via mouse clicks or using Cmd-Tab, preserves the cursor location within a line.