Weird cursor placement and selection glitch in the last line of a paragraph

Ok so usually, I am able to double-click words to select them, or click somewhere in the line to place my cursor there. For some reason, on the last line of this paragraph i am unable to do that, it only selects the last character in the line. The funny thing is this ONLY applies to the last line, if i type a little more and try to select it once its not the last line of the paragraph, it works fine. I would include video of me double clicking words in the second to last line, the doing the same in the last line and showing it only selecting the last character. But sadly, videos aren’t supported for some reason.

I have no clue what could possibly be happening. I have tried deleting and disabling all CSS, going into restricted mode and disabling all plugins, and everything else I can think of.

It also doesn’t let me drag to select, or navigate with arrow keys. I can only do any edits on the last character in the line at any time.

Does it happen with the same text in the Sandbox vault?

I know you said you disabled all CSS snippets, but weird cursor-jumping when arrowing around or not being able to select text properly in the editor can be caused by a poorly written snippet; specifically: changing vertical margins in the editor can cause all sorts of issues (similar to what you describe).

Something to double check.

Turns out it was in fact the vertical margin change I was trying to use for headers. Thought I had disabled it but I must not have. Thank you!