You import looks like it worked perfectly, but each import generates a "found set" of the newly imported records. The original recors are there since you didn't do an "update" option, but they won't be visible on your layout immediately after the import.
Do a Show All Records (see option in Records menu) and I expect that your original 5 will appear on your screen.
No but perhaps I was gqtms
Actually, you aren't the first person to post this question here.
I expect you were.
I tried searching for the answer but I guess I didn't phrase the question properly. Still, it's some small relief to know that I'm not the only numpty on the forum.