Versions
| Title, Format | Label | Cat# | Country | Year | |
|---|---|---|---|---|---|
| I Don't Know Why I Love You (12", Single) | Fontana, Fontana | HOL 212, 876 313-1 | UK | 1989 | |
| I Don't Know Why I Love You (12") | Fontana | 876 315-1 | Canada | 1989 | |
| I Don't Know Why I Love You (12", EP) | Fontana | HOLR 212 | UK | 1989 | |
| I Don't Know Why I Love You (7", Single) | Fontana | HOL 2 | UK | 1989 | |
| I Don't Know Why I Love You (7", Single, Ltd) | Fontana | HOLG 2 | UK | 1989 | |
| I Don't Know Why I Love You (CD, Maxi) | Fontana | 876 315-2 | UK | 1989 | |
| I Don't Know Why I Love You (CD, Maxi) | Fontana, Fontana | HOLCD 2, 876 313-2 | UK | 1989 | |
| I Don't Know Why I Love You (Cass, Single) | Fontana, Fontana | HOLMC 2, 876 312-4 | UK | 1989 |