You whispered something to the person next to you, and at the end of the chain, you compared what you started with to what the last person heard. You may notice a bit of Telephone in how your tagline gets posted.
You need to check to make sure that the site didn’t turn your tagline into a scarlet letter.
Focus on the less superficial stuff, not how tall or suave or sexy you want your prospect to be.
Then you need to combine that thought with something about who you are. If that advice doesn’t work and you’re still drawing a complete blank, you have three choices: Some sites automatically use the first few words of your essay to generate your tagline. This tagline isn’t horrible, and it won’t injure anyone, but that tagline won’t excite anyone either.
Do a search on your site to see which is more prominent — taglines or screen names. Likewise, in the world of online dating, your goal is to present yourself in a way that tends to attract the right kind of person, not every available prospect.